Questions Asked onNovember 6, 2011

1. chemistry

a 3.5L sample of a 5.8M NaCl solution is diluted to 55L.What is the molarity of the diluted solution

2. physics

when a 2.50 kg object is hung vertically on a certain light spring described by hookes law the spring stretches 2.76 cm. A) what is the force constant of the spring. B) if the 2.50 kg object is removed how far will the spring strecth if a 1.25 kg block is

3. chemistry

Hydrochloric acid is usually purchased in concentrated form with a 37.0% HCL concentration by mass and a density of 1.20g/mL. How much of the concentrated stock solution in milliliters should you use to make 2.5L of 0.500M HCL

4. chemistry

A KNO3 solution is made using 88.4g of KNO3 and diluting to a total soultion volume of 1.50l. Calculate the molarity and mass percent of the solution. Assume a density of 1.05 g/mL for the solution.

5. Physics

typically a bullet leaves a standard 45 caliber pistol at 262 m/s. if it takes i millisecond to transverse the barrel, determine the average acceleration experienced by the 16.2 gram bullet within the gun's barrel and then compute the average force exerted

asked by Amanda and Leah
6. chemistry

Describe how you would make 500.0mL of a 0.200M NaOH solution from a 15.0 stock NaOH conentration

7. statistics

suppose x is a uniform random variable with c == 40 and d ==70 . what is the probability that a randomly selected observation is between 43 and 65

8. Calculus

Find The Derivative y=5x^(2)e^(3x) Please Show Work

9. statistics

Suppose a brewery has a filling machine that fills 12 ounce bottles of beer. It is known that the amount of beer poured by this filling machine follows a normal distribution with a mean of 12.44 ounces and a standard deviation of 0.06 ounce. Find the

10. chemistry

A 13.03 g sample contains only ethylene glycol (C2H6O2) and propylene glycol (C3H8O2). When the sample is added to 100.0g of pure water, the resulting solution has a freezing point of -3.5C. What is the percent composition of ethylene glycol and propylene

11. english lit

I am writing a paper on "On the Amtrak from boston to new york city" by sherman alexie. I need to detail how the poet used literary conventions and poetic devices such as meter, imagery, and symbolism to communicate the meaning of the poem. I have the

12. chemistry

Consider the reaction Mg +2HCl ------>MgCl2 + H2 What is the minimum amount of 1.85M HCl is necessary to produce 28.5L of H2 at STP Please help me work this problem

13. chemistry

what is the molarity of an aqueous solution that is 6.75% glucose by mass? Assume a density of 1.03 g/ml

14. chemistry

A 45.8mL sample of 5.8M KNO3 solution is diluted to 1.00L. What volume of the diluted solution contains 15.0 g of KNO3.

15. corrected repost chemistry

to what volume should you dilute 125mL of an 8.00M CuCl2 solution so that 50.0mL of the diluted solution contains 5.9g CuCl2 I have a hard time determing the M1V1=M2V2 is

16. physics

While you sleep, your body is using energy at a rate of 77 W. How many food calories are used during an eight hour period? One food calorie is equal to 4186 joules.

17. Physics

A car is being driven along a country road on a dark and rainy night at a speed of 20 m/s. The section of road is horizontal and straight. The driver sees that a tree has fallen and covered the road ahead. Panicking, the driver locks the breaks at a

18. Physics

Problem 17.26 A thin film of (MgF2) n= 1.38 coats a piece of glass. Constructive interference is observed for the reflection of light with wavelengths of 500nm and 625nm . Part A - What is the thinnest film for which this can occur?

19. Science

How do you set up a controlled experiment ? What's the purpose of a control group? How many variables should a controlled experiment have? What are the difference between observation and inferences? I REALLY NEED HELP!!!! PLEASE HELP ME !!!!

20. algebra

Find the accumulated value of an investment of \$15,000 at 7% compounded semiannually for 4 yrs

21. physics

A certain car can go from 0 to 100 km/h in 10 s. If the engine delivered twice the power to the wheels, how many seconds would it take?

22. Psychology

The neurobiologist explained to the students, "The neural system is very much like the wires connecting your TV and stereo to the electrical outlet. If the wires were not covered with insulation, the signal would short circuit." The neurobiologist was

23. chemistry

how much of a 1.50M solution sodium sulfate solution in milliliters is required to completely precipitate all the barium in 150.0mL of a 0.250 M barium nitrate solution

24. Biology

Which functional group is most likely to be responsible for an organic molecule behaving as a base (-OH donator / H+ acceptor)? A. Phosphate B. Amino C. Hydroxyl D. Carbonyl E. Carboxyl

25. geometry

The measure of an exterior angle of an isosceles triangle is x degrees. What are the possible angle measures of the triangle in terms of x? Describe all the possible values of x.

26. data management

A survey of 1000 veiwers conducted by a television station produced the following data: 40% watched the news at 12:00 60% watched the news at 18:00 50% watched the news at 23:00 25% watched at 12:00 and 18:00 20% watched at 12:00 and 18:00 20% watched at

27. Psychology

Dr. Gillian explained that research has identified over 25,000 genes that are responsible for the genetic information that progresses from generation to generation. These genes are: a. telomeres which cap the chromosome. b. located in a specific order

28. Maths

Calculate speed give your answers in km/p hour Distance = 18 KM Time = 12 minutes S - T

29. chemistry 1211

What is the mass of a ball with a velocity of 35.1 m/s and a wavelength of 8.92 x 10^-34 m

30. algebra

TRANSLATE THE FOLLOWING SENTENCE INTO AN EQUATION DO NOT SOLVE. tHIS IS WHAT I GOT Ten more than three times a number is 130.

31. Math

What is the volume in gallons of a rectangle 118" by 60" by 6"

32. MATH C30

How to find the amplitude, period, phase shift, vertical shift, and the equation of the primary function of the function: y = -cot(1/3x - pi/6) how to find where the period begins and ends

33. math

The graph of y = 7 cos theta + 24 sin theta would be a sinusoid if it were plotted. What would be the first positive value of theta at which there is a high point?

34. Physics check

So I have an experiment and we have to find the mechanical advantage. 1. What is the MA when the load force is 7N and the effort force is 3N? 2. What is the MA when the load force is 7N and the effort force is 6N? My answer for 1. is 2.34 and 2. is 1.17.

35. Physics

In a mass spectrometer, singely ionized carbon-12 (normal carbon of atomic mass number 12) has a radius of curvature of 9 cm. What would be the radius of curvature of singely ionized carbon-14, assuming equal velocities?

36. statistics

If the standard deviation for waiting times in a line is 5 minutes, the standard deviation for the averages of 30 randomly chosen waiting times is _____ minutes.

37. psychology

what are the roles and connections between kissing, touching, and foreplay?

38. Biology

There are 20 amino acids that cells use to build the numerous amounts of proteins that are essential for life. If a protein molecule consisted of 100 amino acids, how many combinations are possible? What is the probability that out of the total possible

39. Physics

A handball is hit toward a wall with a velocity of 15.0 m/s in a positive (forward) direction. It returns with a velocity of 10.0 m/s in a backward (negative) direction. If the time interval during which the ball is accelerated is 0.025 s, what is the

40. Physics

A young woman in the flag corps throws her flag 2.1 meters into the air. How fast was the flag moving when she released it? How long was the flag in the air before she caught it again?

41. Physics

A young woman in the flag corps throws her flag 2.1 meters into the air. How fast was the flag moving when she released it? How long was the flag in the air before she caught it again?

42. Psychology

According to the all-or-none law: a. all axons in an area will fight at a given signal. b. an axon moves from its resting state with various degrees of stimulation. c. only sufficient electrical activity will cause the axon to fire. d. there is a gradual

43. Psychology

The morning was frigid and the roads covered with ice. As Paula drove to work, she was cautious, especially in less-traveled areas. When she entered the main highway, the situation was worse than she expected. As she passed a truck that had slid off the

44. Physics

There are two particles (1 and 2) that are moving around in space. The force that particle 2 exerts on 1 is given by: F21(t)=Fx*e^−(t/T)i^ + Fy*sin(2πt/T) j^ Where the parameters have the values: Fx = 13.4 N Fy = -84.2 N T = 74 s tf = 140.46 s Find the

45. ---college algebra (average rate of change)---

Find the average rate of change of g(x) = -2x2 + 36x - 142 on the interval from x = -5 to x = 10.

46. Calculus

Solve the exponential equation for t. Round your answer to three decimal places if necessary. e^(0.08t)=4 Please show work

47. math

is 2.5/0.08 a terminating or repeating decimal

48. math

1.Estimate 45 x 56 using front-end. 2.Estimate 45 x 56 using rounding.

49. early childhood education

a teacher requests that a child use a small stepladder to reach a book on a shelf she is helping the child develop a)primitive reflexes b)movement qualities c)locomotor reflexes d)spatial awareness i put b which of the following is an example of a closed

50. CHEMISTRY (ionization energy)

find the ionization energy of I-, I, and I+ I know you have to use E= hc/lambda, and c=lambda x v, but how do i get v?

51. Walmart

What is Walmart internal alignment? What is walmart external competitiveness? thanks

52. Chemistry! HELP;

An atom of potassium (K) has 19 protons: 18 electrons in its inner electron energy levels and 1 electron in its outer energy level. What is the easiest way for this atom to get a filled outer energy level? What is formed?

53. Chemistry

If 395 grams of water at 21 Celsius absorbs 285kJ of heat from a mountain climbers stove at an elevation where the boiling point of water is 87 Celsius, is this amount of energy sufficient to heat the water to its boiling point? How many kJ are required to

54. Physics

A tractor pulls forward a moving plow with a force of 2.5*10^4N, which is just large enough to overcome friction. A) what are the action, reaction forces between the tractor and the plow B) Are these reaction, action forces equal in magnitude and opposite

55. Physics

Maricruz slides a 66 kg crate, m, up an inclined ramp 2.0 m long and attached to a platform 1.0 m above floor level, as shown in Figure 10-19. A 415 N force, F, parallel to the ramp, is needed to slide the crate up the ramp at a constant speed. (a) How

56. statistics

population with a mean of 53.1 and standard deviation of 4.43 Calculate z score for xbar 49.8 from a sample of size 11 Someone please please help me!

57. Algebra II

Bill drove from Ajax to Bixby at an average speed of 50 mph. On the way back he drove at 60 mph. The total trip took 42/5 hours of driving time. Find the distance between the two cities.

58. Texas Government

What term best describes the Texas legislature? a. moderate professional b. citizen c. moderate professional/citizen d. congressional I would say C is the answer from this paragraph. Today the Texas legislature falls between those legislatures that are

59. chem

what is the chemical formula for filtered calcium carbide + water??

60. calculus

The base of a triangle is on the x-axis, one side lies along the line y=3x, and the third side passes through the point (1,1). What is the slope of the third side if the area of the triangle is to be a minimum.

61. Maths

A cuboid has total surface area of 40 meter squar and its lateral surface area is 26 meter squar .Find the area of its surface

asked by Chandan kumar
62. health

9. Human blood, which has a pH of approximately 7.4, is a/an _______ substance.

63. Calculus

Two posts, one 12 feet high and the other 28 feet high, stand 30 feet apart. They are to be stayed by two wires, attached to single stake, running from ground level to the top of each post. Where should the stake be placed to use the least wire?

64. Physics

A ball player hits a home run, and the baseball just clears a wall 17.0 m high located 124.0 m from home plate. The ball is hit an an angle of 35° to the horizontal, and air resistance is negligible. Assume the ball is hit at a height of 1.0 m above the

65. chemistry

to what volume should you dilute 125mL of an 8.00M CuCl2 solution so that 50.0mL of the diluted solution contains 5.9g KNO3 I have a hard time determing the M1V1=M2V2 is

66. chemistry

pleast help me work this prob lead is a toxic meatal that affects the central nervous system. a Pb-contaminated water sample contains 0.0011% Pb by mass. What vilume of the water in milliliters contains 115g of Pb? (assume that the density of the solution

67. science

your weight is 600 newtons and you have just finished building a raft which weighs 1000 newtons. what is the smallest upthrust force needed so that it will float with just you on it ? (please answer really quick )

68. Physics

Sau-Lan has a mass of 47 kg. She rides the up escalator at Ocean Park in Hong Kong. This is the world's longest escalator, with a length of 227 m and an average inclination of 31°. How much work does the escalator do on Sau-Lan?

69. calc 3

A cardboard box without a top is to have volume 500000 cubic cm. Find the dimensions which minimize the amount of material used. List them in ascending order.

70. geometry

the measure of an exterior angle of an isosceles triangle is x. what are the possible angel measures of the trianglein terms of z? describe all the possible values of x.

71. Texas Government

Which of the following statements about Texas state legislative elections is true? a. There are more competitive seats than safe seats. b. There are more safe seats than competitive seats. c. There are an equal number of safe and competitive seats. d.

72. Texas Government

Minor bills are much more likely to pass than major bills. a. yes b. no It is an obviously yes because minor bills are through special committees who make the bill pass.. correct?

73. Chemistry

A student conducts an experiment to determine the enthalpy of neutralization for phosphoric acid reacting with sodium hydroxide. The student combines 25.0 mL of equimolar solutions of acid and base, both having an initial temperature of 22.5 °C, in an

74. Chemistry

A student conducts an experiment to determine the enthalpy of neutralization for phosphoric acid reacting with sodium hydroxide. The student combines 25.0 mL of equimolar solutions of acid and base, both having an initial temperature of 22.5 °C, in an

75. chemistry

Duralin is an alloy of aluminium containing 4.5% manganese, 3.5% copper, and 0.45% magnesium. How much magnesium is present in a 90 g sample of this alloy? Answer in units of mol

76. geometry

solve this proof: PR is congruent to DE, PT is congruent to DF, Angle R is congruent to Angle E, Angle T is congruent to Angle F.. Prove Triangle PRT is congruent to Triangle DEF

77. Psychology

Dr. Lange is a developmental psychologist. He specializes in cognitive development during the period of infancy. Like most psychologists who focus on specific periods of development, his studies: a. emphasize the chemical changes in the synaptic gap. b.

78. geometry

22. If I drink orange juice, then I am healthy.

79. english

Hello! I'm a French student,I'm 17, I've learned the beginning of Freedom by Jonathan Franzen. Sometimes, it seems confused as it's my second language. So I need help, please. Can you explain what happened with Patty, Eliza, Carter, Richard and Walter in

80. ma116

write an inequalitity that shows you spent 8,000

81. pre-calculus

a pasture is twice as long as it is wide. Its area is 115,200 ft square. How wide is the pasture

82. Science

A wave geneerantor produces 16.0 pulses in 4.00s . What is the frequence ?

83. Math C30 ( trig )

Solve : cosxtanx + root3cosx - root3/2tanx - 3/2 = 0 Give exact answers and formula for the general solution as well as the specific solutions.. Help

The exact price of the product should be mentioned: a. early in the letter, as soon as the offer is first mentioned. b. in the middle of the letter, as soon as benefits are first mentioned. c. in the last fourth of the letter, after the copy makes the

85. social studies, civics

so i have to write a paper pretending to be a republican candidate, and trying to get my class members to vote for me. I really have no idea how to do this /: any ideas?

86. physics

A mover pushes a couch a distance of 4 m to the top of a ramp into the back of a truck using 500 N of force. A) What is the work input of the mover? B) What is the mover’s power if the task takes 10s? C) If the mass of the couch is 100 kg and the back of

87. Math C30 ( trig )

A roof in the shape of an upside down cosine wave is to be buile to cover an arena. The arena is 24m wide, the height of the roof at either side wall is 5m, and the maximum height of the roof is 9m. A) write a function that gives the height of the roof in

88. chemistry

A 250 L vessel is evacuated and then connected to a 50.0 L bulb with compressed nitrogen. The pressure in the combined containers is 1672 mm Hg. If the temperature remained at 20 °C throughout the process, what was the initial pressure in the 50.0 L bulb?

89. MATH C30

Solve cosxtanx + sqroot3cosx - sqroot3/2tanx - 3/2 = 0 interval 0 to 2 pi exact answers and formula for the general solution as well as the specific solutions. Sorry Steve, missed it last night.

90. Physics

A uniform 2.0 kg cylinder can rotate about an axis through its center at O. The forces applied are: F1 = 5.70 N, F2 = 3.90 N, F3 = 4.30 N, and F4 = 7.00 N. Also, R1 = 12.8 cm and R3 = 4.50 cm. Find the angular acceleration of the cylinder.

91. science

preparation of copper sulphate crystals excess copper oxide is needed above a)how do you know the solid is in excess? b)how do you remove the excess? c)what colour is the solution? d)give the next to steps to make crystals?

92. History

Did siblings in Salem live near eachother? If a brother was married, was his sister living with him or in another house?

93. physics

1. In which of the following cases is work done on the object? A. Lifting an object off the floor. B. Pushing an object, but it does not move C. Carrying an object at a constant velocity D. None of these 2. The energy of a system increases when A. a force

94. math

The playground at molly's school is in the shape of an equilateral triangle.The playground at david's school is in the shape of an acute triangle. could molly and david go to the same school? Explain.

95. physics

two masses (11kg and 33kg) are connected by a string and hung over a pulley in a steamy sauna where air resistance has a force of 77N on all objects. Find the acceleration of the 33kg block

96. physics

my answer for these are 1. a 2.c 3 d but not sure so please anyone see if i am correct 1. In which of the following cases is work done on the object? A. Lifting an object off the floor. B. Pushing an object, but it does not move C. Carrying an object at a

97. Algebra 3

Trying to solve this rational inequality but can't figure how to factor the numerator. ((3x-2x^2)/(4-x^2))

98. Calculus

A certain calculus student hit Mrs. Evans in the head with a snowball. If the snowball is melting at the rate of 10 cubic feet per minute, at what rate is the radius of the snowball changing when the snowball is 1 foot in radius?

99. statistics

when finding the area to the left of the Z score and Z= 1.43 do i subtract the z score from one or is that only when finding the area to the right of Z

100. math

-k= 287.658 I need help with this thank you

101. math

sgr2 sinD cosD=sinD

102. physics

4. one joule per second is equal to one--- 5. Joules per second is an alternative unit use for expressing---- 6. A typical bicycle is a --- machine 7. When Ma>1 the machine effort force is ---- than the resistance force. 8. A landscaper pushes a lawnmower

103. physics

An object acted on by three forces moves with constant velocity. one force acting on the object is in the positive x direction and has magnitude of 6.5 N, a second force has a magnitude of 4.4 N and points in the negative direction. Find the direction and

104. MATH C30

A roof in the shape of an upside down cosine wave is to be built to cover an arena. The arena is 24 m wide, the height of the roof at either side wall is 5 m, and the max height of the roof is 9m . write the function that gives the height of the roof in

105. health crossword puzzle

studying about drugs i have a crossword puzzle and stuck need a 11 letter word that describes psychological depencene on a drug need a 11 letter word for : effect some drugs have when mixed together i got: sideaffects need 9 letter word blocks a persons

106. math

tan(2theta-34degrees)=squareroot3, theta range{real numbers of degrees}

107. English

I vary the last sentence. Could you check it please? In conclusion, he says that though the populations of many marine species are decreasing very quickly, people have not been aware of the problems with ocean wildlife because these species are not

108. chemistry

in saturated sugar solutions what is the solute? what is the solvent?

109. trig

write equations expressing: 19cos(theta-50degrees) as a sum of sine and cosine.

110. math

Meant to say 6 3/7 - 7 1/7 = - 1 2/7

111. statistics

A random sample of n = 9 scores is obtained from a population with ì = 50 and ó = 9. If the sample mean is M = 59, what is the z-score corresponding to the sample mean?

112. algebra

what does the a stand for in Pa^t what does the r stand for in Pe^rt how are they related?

113. factoring polynomials help?

16x^4-1 4x^4+39x^2-10 find the real number solutions of these equations. 3x^4+15x^2-72=0 x^3+2x^2-x=0 Thanks!

114. rao's iit 6 class

if sides of a triangle is in the ratio 2,3,4 and shotest side is 6cm then find perimeter of a triangle?

115. Calculus

Mr. Cook was painting Arvada West High School, standing on top of a 25]foot ladder. Why? We will never know. However, he was horrified to find the ladder being pulled away by the same notorious student that threw a snowball at Mrs. Evans. The base of the

116. 9th grade math honors

suppose t(1)=-91 and -67 is another term of an arithmetic sequence, with. What is the equation of the nth term of the sequence if there are n terms between these two?

117. statistics

A forest fire is burning down a narrow valley 3 miles wide at a speed of 40 feet per minute. The fire can be contained by cutting a firebreak through the forest across the valley. It takes 30 seconds for one person to clear one foot of the firebreak. The

118. History

Assignment: Write an essay about all of the information of Watergate. Write it in from the point of view of a reporter trying to solve the mystery (break the story) and reporting the story after the fact. Your essay should be at least 200 words. Be

119. phi.103

. "~ P v Q" is best read as (Points : 1

120. Physics

A bar magnet with its south pole down passes through a conducting ring. As viewed from above the ring, in which direction does the current flow?

121. physics

A mover pushes a couch a distance of 4 m to the top of a ramp into the back of a truck using 500 N of force. A) What is the work input of the mover? B) What is the mover’s power if the task takes 10s? C) If the mass of the couch is 100 kg and the back of

122. Physics

An horizontally flying airplane has a 20 m wing span. If the vertical component of the Earth's magnetic field is 2*10^-5 T, and the voltage measured from wing tip to wing tip is 4 mV, What is the ground speed of the plane?

123. trig

write an equation expressing: cos37cos99 as a sum Review question. I know the formula. Having trouble with working it out.

124. Physics

A particular magnetic field points west. A proton moved from north to south. What direction is th magnetic force on the proton? Up,down,east or northwest

125. statistics

Help me! Population of heights of college students is approximately normally distributed with a mean of 64.37 inches and standard deviation of 6.26 inches A random sample of 74 heights is obtained. Find the mean and standard error of the x bar distribution

126. Chemistry

CFCs such as CF2Cl2 are refrigerants whose use has been phased out because their destructive effect on Earth's ozone layer. The standard enthalpy of evaporation of CF2Cl2 is 17.4 kJ/mol, compared with change in H(vapor)=41kJ/mol for liquid water. How many

127. Science

What are the main rules of safety that we follow in science classes

128. College Physics

A child plays on a bungee cord and oscillates with a certain frequency f. An adult with a mass that is 16 times greater than that of the child then uses the same bungee cord. What is the ratio of the frequency with the adult to the frequency with the

129. Physics

An airplane passenger carries a 260 N suitcase up the stairs, a displacement of 3.80 m vertically, and 4.30 m horizontally. (a) How much work does the passenger do? (b) The same passenger carries the same suitcase back down the same stairs. How much work

130. geography

Can you please check my answers? 1. Which is larger, the Red Sea or the Mediterranean Sea? The Mediterranean Sea 2. How many degrees are there between the Tropics of Capricorn and Cancer? There are 46 degrees between them. 3. What is the capital of Turkey,

131. English

The strategies for writing positive or neutral message. is my response correct?: In the opening avoid personal information state your main idea so it wouldn't be overlooked. In the body of the message provide reasons and/or details for the main idea. Close

132. Physics question

A student librarian picks up a 2.2 kg book from the floor to a height of 1.15 m. He carries the book 8.4 m to the stacks and places the book on a shelf that is 0.35 m above the floor. How much work does he do on the book?

133. Math

if a football team gained 13 yards in 3 tries how many yards will they gain in 9 tries

134. anthropology

What are society's attitudes towards generalized anixety disorder?

135. Social Studies

What variety ways did the Plain Indians hunt the buffalo???? i know i wrote it already it's just it's easier for u guys to understand on what subject im in :)

136. algebra

a bank opens with \$4.05 in nickels and pennies. There are 157 coins in total. how many nickels and how many pennies

137. Calculus

Mr. Cook was painting Arvada West High School, standing on top of a 25]foot ladder. Why? We will never know. However, he was horrified to find the ladder being pulled away by the same notorious student that threw a snowball at Mrs. Evans. The base of the

138. Physics

The tops of the towers of the Golden Gate Bridge, in San Francisco, are 227m above the water. Suppose a worker drops a wrench from the top of a tower. If the average force of air resistance is 22% of the force of free fall, with what speed will the wrench

139. physics

A 25.0 kg pickle is accelerated from rest through a distance of 6.0 m in 4.0 s across a level floor. If the friction force between the pickle and the floor is 3.8 N, what is the work done to move the object?

140. chemistry

give the practical details of how you would prepare a 0.5M hydrochloric from a stock of 34%(w/w)with relative density of 1.18.

141. Math

Find the probability that a randomly selected sample of 30 men has a mean greater than 68 inches. The mean height of men is 69 inches and standard deviation of 2.8 inches

142. sig figs

70.74074074 ^ 1/4 = a 2.900129566 = a Now I have to round to 3 significant digits. Is it 2.90 or 2.9001?

143. Finance

You deposit \$1000 in an account that pays 8% interest compounded semiannually. After 2 years, the interest rate is increased to 8.40% compounded quarterly. What will be the value of the account after 4 years?

144. algebra

find real numbers a and b if a(3x+1)+b(5x-1)=11x+9 for all x€r

145. ACC260

Which segment of its operations got Enron into difficulties? -I am unable to pin-point what action first got Enron into trouble? Was it that they were borrowing money that they did not have?

146. English

Could you please check the first part of an interview I need to prepare on engangered species? Thank you. 1) The interviewee works for an organization, which safeguards the conservation of hundreds of endangered species around the world. 2) These species

147. physics

A dam blocks the passage of a river and generates electricity. Approximately 57,000 kg of water fall each second through a height of 19 m. If one half of the gravitational potential energy of the water were converted to electrical energy, how much power

148. anthropology

What is the educational awareness of generalized anxiety disorder?

149. algebra - exponentials

My question is how do I know that N increases by a factor of 2.9 each day. (see below) Let N(t) be number of bacteria after t days. N(t) = Pa^t for some constants P and a. N(2) = 5400 and N(6)=382,000. a)before working problem, estimate value of N(5). b)

150. Biology

If a protein's primary structure is predetermined or directed by a "source." what might this "source" be?

151. Trigonometry

Calculate and write result in a+bi form. 5+10i/3-4i

152. Social Studies

how did the representatives became independent from the english parliament? And i tried wikipedia

asked by Karann Help!!!
153. statistics

Health care workers are at risk of being exposed to blood-borne pathogens through needle-stick and other sharp object injuries. The pathogens of primary concern are the human immunodeficiency virus, hepatitis B virus, and hepatitis C virus. When a

154. math c30

solve cosxtanx + root3cosx - root3/2tanx - 3/2 = 0 exact value answers and formula for the general solution and specific solutions.

155. math

Suppose you see a car with an advertised price of \$28,450 at \$594.60 per month for 5 years. What is the amount of interest paid? \$7226? please help

156. 6th grade math

Which comparison is correct? A. < 0.05 = 50% B. 0.7 = < 10% C. < 25% < 0.9 D. 0.3 < 36% =

157. algebra

If computing N(t) = Pa^t where P=642.035376 and a = 2.900129566 (both are stored in calculator), to what extent should the values of N(5), N(7) and N(9) be rounded? and why? Note: N(5)= 131,718 N(7)= 1,107,849 N(9)= 9,317,847

asked by sig figs
158. calculus

Water is flowing freely from the bottom of a conical tank which is 12 feet deep and 6 feet in radius at the top. If the water is flowing at a rate of 2 cubic feet per hour, at what rate is the depth of the water in the tank going down when the depth is 3

159. History

During 1692, specifically in Salem Village, many witches would do voodoo such as seeing who you would marry with egg whites or etc. Did they do anything special to foretell the future to see certain events? Did they have to cast certain spells? I know now

160. Physics

A wire is frictionless between points A and B and rough between B and C. A is 5m above the ground, B is zero, and C is 2m above the ground. The 0.400kg bead starts from rest at A. If the bead comes to rest at C, find the loss in mechanical energy as it

161. Texas Government

In general, ________ redistricting is considered constitutional by the courts, but ________ redistricting is considered unconstitutional by the courts. a. race-based; partisan b. partisan; race-based c. race-based; non-partisan d. non-partisan; partisan

162. Chemistry -buffers.

The pH of an arterial blood sample is 7.15. upon acidification of 10 ml of the plasma 5.91ml of CO2 is produced at standard temperature and presure. Calculate-a) total CO2 in the specimen b)the individual concentration of disolved CO2(H2CO3) and HCO3-

163. calculus

A right triangle with hypotenuse 5 inches is revolved around one of its legs to generate a right circular cone. Find the radius and height of the greatest volume cone.

asked by jj snoke
164. math

-k=287.658 divide by o so k=0? correct? thenk you

165. math

Sylvia has a jewelry collection of bracelets, necklaces, and earrings. She has 16 bracelets. The number of earrings is 2 times the number of necklaces. She has 43 pieces of jewelry in all. How many of each piece of jewelry does she have?

166. Physics

A hockey puck slides off the edge of a table with the initial velocity of 20m/s. The table height is 2.0 m. What is the accleration of the puck right after it leaves the table?

167. physic

Before practicing his routine on the rings, a 67 kg gymnast hangs motionless, with one hand grasping each ring and his feet touching the grounnd. Both arms make an angle of 24 degrees with the vertical.(a) If the force exerted by the rings on each arm has

168. AP Calculous

A particle moves on the x –axis so that its position at any time is given by x(t) = 2t3 + 1. a. Find the acceleration of the particle at t = 0. b. Find the velocity of the particle when its acceleration is 0. c. Find the total distance traveled by the

169. physical science

a yo-yo is swung in a vertical circle in such a way that its total energy KE+ Pe is constant. At what point in the circle is the speed a maximum? minimum? why?

170. physics

A dam blocks the passage of a river and generates electricity. Approximately 57,000 kg of water fall each second through a height of 19 m. If one half of the gravitational potential energy of the water were converted to electrical energy, how much power

171. Calculus

Optimization An offshore oil well is 2km off the coast. The refinery is 4 km down the coast. Laying a pipe in the ocean is twice as expensive as on land. What path should the pipe follow in order to minimize the cost?

172. Texas Government

Which of the following areas of the state is relatively safe for the Republican Party? a. urban areas b. Rio Grande Valley c. Panhandle d. East Texas These are just such weird questions.. I would say urban areas...

173. Math

Convert the following credit card rate to the APR. Oregon, 1 3/4% per month , = 1.75%?

174. calculus

Find a point c satisfying the conclusion of the Mean Value Theorem for the following function and interval. f(x)=x^−1 [1,9]

175. Pls help me now

Solve;a=g(sin 30-0.15cos30)

176. Physics

A boy kicks a football with an initial velocity of 20 m/s at an angle of 30 above the horizontal. What is the vertical component of it's velocity at the highest point of it's trajectory?

177. Science

Hi I'm pretty sure the answer is A, but I'm not completely positive. Am i correct? Which of the following pairs of words can be used correctly to describe alleles? A) dominant or recessive B) homozygous or heterozygous C) genotype and phenotype D)

178. calculus

A car[enter will be building a stained glass jewelry box. The frame of the box is to be built from a 48 inch stripe of metal which will be cut into 12 pieces. The 12 pieces are then soldered to form a rectangular box whose base is twice as long as it is

asked by Demetra Mallios
179. Science

Hi I'm pretty sure the answer is A, but I'm not completely positive. Am i correct? Which of the following pairs of words can be used correctly to describe alleles? A) dominant or recessive B) homozygous or heterozygous C) genotype and phenotype D)

180. Texas Government

In the past, Texas employed multimember districts in some areas. What is the impact of multimember districts? a. Minority voters are underrepresented. b. Minority voters are overrepresented. c. Democrats have an advantage. d. Republicans have a

181. Science

Hi I'm pretty sure the answer is A, but I'm not completely positive. Am i correct? Which of the following pairs of words can be used correctly to describe alleles? A) dominant or recessive B) homozygous or heterozygous C) genotype and phenotype D)

182. Science

Hi I'm pretty sure the answer is A, but I'm not completely positive. Am i correct? Which of the following pairs of words can be used correctly to describe alleles? A) dominant or recessive B) homozygous or heterozygous C) genotype and phenotype D)

183. Chemistry

Use enthalpies of formation from the textbook to calculate the standard enthalpy of the reaction for the following methane- generating reaction of methanogenic bacteria given delta Hf of CH3NH2=-22.97kJ/mol: 4CH2NH2+2H2O----->3CH4+CO2+4NH3

184. Math Homework

Calculate the monthly finance charge for the following credit card transaction. Assume that it takes 10 days for a payment to be received and recorded and that the month is 30 days long. (Round your answer to the nearest cent.) \$3,000 balance, 21% rate,

185. Calculus

Two posts, one 12 feet high and the other 28 feet high, stand 30 feet apart. They are to be stayed by two wires, attached to single stake, running from ground level to the top of each post. Where should the stake be placed to use the least wire?

186. chemistry

if a sample of NO2 gas has 4.5ml. what is the cooled constant pressure from 45 to 5 degrees?

187. Antigone Essay due tmr!

Antigone is the true tragic hero because she acts without anticipating the consequences of her rebellion, realizes she has made an irreversible mistake only after it is too late to fix it, and is responsible for an unhappy ending for all of the characters.

188. engineering

Problem 1: A long embankment is located on a soil profile consisting of 4m of medium clay followed by 8m of medium to dense sand on top of bedrock. A vertical settlement of 5mm at the center of the embankment was measured during construction. Assuming all

asked by Can someone help me please?
189. algebra

SEE BELOW PLEASE at******** If computing N(t) = Pa^t where P=642.035376 and a = 2.900129566 (both are stored in calculator), to what extent should the values of N(5), N(7) and N(9) be rounded? and why? Note: N(5)= 131,718 N(7)= 1,107,849 N(9)= 9,317,847

asked by sig figs ques 2
190. Social Studies

Describe how are represtative governments became more and more independent from the english parliament and king

asked by Karan Help!!!
191. algebra

SEE BELOW PLEASE at******** If computing N(t) = Pa^t where P=642.035376 and a = 2.900129566 (both are stored in calculator), to what extent should the values of N(5), N(7) and N(9) be rounded? and why? Note: N(5)= 131,718 N(7)= 1,107,849 N(9)= 9,317,847

asked by sig figs ques 2
192. Fluid ''Physics''

A block of metal floats in oil of density 700Kg/m3 with 3/4 of volume in mass. Find the density of metal.

193. josh

A cardboard box without a top is to have volume 500000 cubic cm. Find the dimensions which minimize the amount of material used. List them in ascending order.

194. Chemistry

If there is a radiation that has a half life of 10 days and we have it for 110 days, what will be the fraction of radiation left?

195. College Physics

A steel piano string for the note middle C is about 0.68 m long and is under a tension of 400 N. If the fundamental frequency is 226 Hz, what is the string’s diameter?

196. Math Homework Help Please

Calculate the monthly finance charge for the following credit card transaction. Assume that it takes 10 days for a payment to be received and recorded and that the month is 30 days long. (Round your answer to the nearest cent.) \$3,000 balance, 21% rate,

197. economics

Can you analyze and label at least 10 advertisements as to whether they are competitive or informative?

198. Texas Government

So if the safest area is the panhandle for Republican PArty then Which of the following areas of the state is relatively safe for the Democratic Party? a. Panhandle b. Hill Country c. Dallas and Houston suburbs d. Rio Grande Valley I would say C.

199. sociology

Barak Obama’s master status is: (Points : 1) African American White American Married man with children X President of the United States

200. chemistry

Ammonia gas is dried using

201. trig

write an equation expressing 19cos(theta-50degrees) as a sum of sine and cosine.

202. Chemistry

please help! Is RTP in chemistry (thermochemistry and electrochemistry) referring to room temperature of 25degreeC (or 298K) and 1atm, or 20degreeC (293K) and 1atm? In my lecture notes on gas law, they stated RTP refers to 25degreeC, but in my electrochem

203. Finance

convert the following credit card rate to the APR. nebraska, 0.03562% daily rate? Round to the nearest whole number

204. political science

In need of help on my political science homework please help with these questions Only these questions left! One reason why the US has only 2 major parties is that it has: A. insufficient opportunities to bribe candidates B. too much involvement by

205. ALGEBRA

use the associative law of addition to write an equivalent expression (r+st)+ 8

an you help me please to get an ideas or relevant answers to the questions. thank you 1. how does money affect in business firms. ans. money or the exchange rates is the most important in order to maintain and stabilise the business firms. 2. Is political

207. Maths

the question says: write down all factors of 6 Show that the sum of all the factors of 6 is equal to 2 x 6 (i got the first part right with the factors but i don't know how to do the second part)

208. Science-Biology

If a mother has brown eyes and a father has blue eyes why do two of their children have blue eyes and one have brown eyes?

122 band members all need to march in n number of rows write an algebric expression for the number of band members in each row

210. Algerbra

Q1. Solve the system of equationd by addition method. -2x+y=6 -3x-4y=20 Select the correct choice below and, if necessary, fill in the answer box to comlete your choice a)The solution is__(simplify your answer. type an ordere pair) b) Infinitely many

asked by Zedrick Dandridge
211. Accounting

Explain why it is important to analyze each financial transaction of a business and to report it in the Accounting Information System.

212. General Chemistry

Calculate the theoretical pH after 2.50 mL and 9.50 mL of NaOH has been added in both the titration of HCl and of HC2H3O2. Indicate if the volume of NaOH is before or after the equivalence point. Compare these theoretical values with the actual values

213. Social Studies

Please check my essay if it's good btw this is a DBQ. Also what else should I add to my conclusion. My ss teacher said that it can be 2-3 sentences. Native Americans Before Columbus, Native American cultures civilization often grew in relation to their

214. math

Solved problems on matrices

215. Economics

You are considering quitting work for two years to earn an MBA. Your current job pays \$25,000 per year (after taxes), but you could earn \$55,000 per year (after taxes) if you had a MBA at Southern University. Tuition is \$10,000 per year and the cost of an

216. History

During 1692 in Salem Village , how did the court room look like and was there only one magistrate? And what was the name of the area where the accused would stand?

217. Check Business Law

(TCO 4) State court jurisdiction can be established in all of the following ways EXCEPT: a)when the defendant is a resident of the state, a summons may be served at that residence. b)cases involving more than \$75,000 where the plaintiff and the defendant

218. physics

A 75g person on skis is going down a hill sloped at an angle 30.the coefficient of kinetic friction between the skis and the snow is 0.15.how fast is the skier going 10s after starting from rest?

219. trig

write a product of two trig functions that equals 1.

220. Biology

Two parents are blond haired and their children are blond haired. Why is this so?

221. econ

There are so many industries having websites for retail. However, not every industry is successful in online retail. In your opinion, what are the common characteristics of industry which can sell products successfully in online retail? Please provide at

222. world history

I need to do a persuasive essay for my world history class on the Industrial Revolution and i want to know if it makes sense. The industrial revolution changed society. Its the reason why we're in the society we are in now. Before the industrial

223. econ

Microsoft has been a giant in the software industry. Can we define Microsoft as a monopoly? Please explain. In addition, whether the Learner Index works well to define the market power for Microsoft in the software industry? Explain your answer. please

224. Science

How is the technology of Sonar related to the social, environmental, political, ethical, and the economical condition of a country? Please explain it clearly

225. Pls help me now

A 75g person on skis is going down a hill sloped at an angle 30.the coefficient of kinetic friction between the skis and the snow is 0.15.how fast is the skier going 10s after starting from rest?(answer=36m/s)

226. earth

sam weighs 720N on the earth and 120N on the moon.what does this tell you about the value of gravity on the moon?

227. physics

a student has six textbooks, each has a thickness of 3.6cm and a weight of 28 N. What is the minimum work the student would have to do to place all of the books in a single vertical stack, starting with all the books on the surface of the table?

228. Science

Why are your ears at the side of your head and not in front where your eyes are?

229. Texas Government

Creating a realistic state budget is much more difficult when a legislature uses a. annual sessions. b. year-round sessions. c. short sessions. d. biennial sessions. I am guessing short sessions?

230. physics

suppose a simple pendulum was released from an angle of 58 degrees, with a length of 0.75m and mass of .15kg. what would be the speed of the bob at the bottom of the swing? To what height would the bob get to on the other side. What angle of release would

231. Biology

How can you experimentally determine the total volume of blood in a human?

232. math

Mike completed 19 math problems before dinner for tonight’s homework, and he completed x problems after dinner. Write an expression to determine the total number of problems he completed.

233. ENGLISH

Please check for any errors. If you would correct them i would appreciate it. Obesity is one of the major causes of health problems in the United States. Research has been done about this topic for many years. It is more common in the United States because

234. Chemistry

Give the letter notation for the subshells designated by the following quantum numbers, and the number of orbitals possible for each subshell. n = 5, l = 4

235. geography

Thank y'all! I looked in my history book at the map in there and it is not the best one. I see now where part of Indonesia is in the Southern Hemisphere. So, The answer is North America and Europe are the only continents that do not have any land in the

236. Science

Identify commonly used lab equipment. (beaker, graduated cylinder, triple beam balance, test tube, Patri dish) I really don't need answer. Does this means I have to write definitions for each lab equipment???? I really need help.

237. calculus

Suppose the area of a square is increasing with time.At the time when the side of the square is 4 meters and the change in area is 2 sq meters per min, find the change in the length of the side of the square.

238. \$\$college algebra\$\$

Consider g(x) = -2x2 + 36x - 142 for x > 9. Find g-1(12). If this value does not exist, the type DNE in the space provided.

239. accounting

The board of trustees of a local church is concerned about the internal accounting controls pertaining to the offering collections made at weekly services. They ask you to serve on a three-person audit team with the internal auditor of the university and a

240. College Algebra

Use rational root theorem and the factor theorem to help solve the following equation X4-2x3-13x2+38x-24=0

241. statistics

The scores on an economics examination are normally distributed with a mean of 66 and a standard deviation of 14. If the instructor wishes to assign a grade of A to the top 10% of the class, what is the lowest score a student may have and still obtain an

242. abnormal psychology

alcohol is link to what theoretical approach

243. chemistry 11

a chamber contains 5.5 grams of hydrogen gas another chamber contains chlorine when the valve is opened the react to form hydrogen chloride with a mass 1995.5 grams. What is the mass of chlorine?

244. math

See below PLEASE at ******** If computing N(t) = Pa^t where P=642.035376 and a = 2.900129566 (both are stored in calculator), to what extent should the values of N(5), N(7) and N(9) be rounded? and why? Note: N(5)= 131,718 N(7)= 1,107,849 N(9)= 9,317,847

245. calculus

a billboard 20ft tall is located on top of a building with its lower edge 60 ft above the level of a viewers eye. how far from a point directly below the sign should a viewer stand to maximize the angle (theta) between the lines of sight of the top and

246. math

A film industry screening theater has 6 seats in the first row and 5 rows in all each successive row contain one additional seat. How many seats does this theater hold?

247. paper!!final help plz

im doing a paper on anceiant agriculture i have wtiiten the paper but i need an into sentence just a good first sentencee

248. calculus

water in a paper conical filter drips into a cup. let x denote the height of the water in the cup. if 10 in^3 of water are poured into the filter, find the relationship between dy/dt and dx/dt so the paper filter is 4 inches tall whith a radius of 2

249. Managerial ECON

Suppose that a firm is currently employing 10 workers, the only variable input, at a wage rate of \$100. The average physical product of labor is 25, the last worker added 10 units to total output, and total fixed cost is \$5,000 a. What is marginal cost? b.

250. Managerial ECON

You are planning to estimate a short- run production function for your firm, and you have collected the following data on labor usage (L) and output (Q): Labor usage Output 3 1 7 2 9 3 11 5 17 8 17 10 20 15 24 18 26 22 28 21 30 23 a. Does a cubic equation

251. MATH...PLZ HELP

Given a level of confidence of 99% and a population standard deviation of 13, answer the following: (A) What other information is necessary to find the sample size (n)? (B) Find the Maximum Error of Estimate (E) if n = 61. Show all work.

252. Physics

A Silver bowl has a mass of 1.78kg. It is shaped like a cylinder and has a diameter of 35.0 cm and a height of 8.00cm. It is placed in water. Find (a)the volume of water it displaces, (b) The buoyant force exerted on it by the water, and(c)how deeply it

253. Calculus

Differentiate. f(x)= -8e^(5x)

254. chemistry

A 130.0 mL buffer solution is 0.100 M in NH3 amd 0.135 M in NH3 and 0.135 M in NH4Br. What mass of HCI could this buffer neutralize before the pH fell below 9.00?

255. algebra

What is the appropriate format and answer to the following multiplication problem involving numbers in scientific notation: (5 x 10^4) (9 x 10^4)?

256. social studies

Nubia was a kingdom to the south of egypt true or false

257. Calculus

Graph f(x) = 4^(x - 1) Please show work

258. AP chemistry

What is the heat of formation value for AQUEOUS phosphoric acid (H3PO4)? I can only find it for liquid. thank you

259. chemistry

Zinc chloride (ZnCl2) is 52.02% chlorine by mass. What mass of chlorine is contained in 53.6 g of ZnCl2? Answer in units of g

260. algebra

Find value of log (base 8)log (base 2) log (base 3)log (base 3) (27)^3 I endedup with 1.000063462 which was wrong

261. Calculus

Find The Derivative y= 9e^(x)/ 2e^(x)+ 1 Please Show Work

262. Confused about how this is worded?

I'm having a hard time trying to understand what my teacher and the article I read are saying here? Could you put it into easier words for me? For the West, "A house was a capital investment, perhaps the prototype for all fixed capital investment, an

263. English

I need your help to understand the meaning of a few words (descend, feeding apparatus) and check the word choice. Thank you. 1)According to the speaker, education is the most successful way of combating risks (threats?) to endangered species. The

264. Calculus

Differentiate f(x)=(x^(3)-8)^(2/3) Please Show Work

265. algebra

Town has popultion of 5,000.Number of people infected after t days with a disease is N(t) = 5000/1 + 21.7e^-0.4t Find number initially infected find number infected after 12 days

266. algebra

use the associative law of addition to write an equilalent expression (r+st)+8

267. PHYSICS HELP

m1 = 2.7 kg block slides on a frictionless horizontal surface and is connected on one side to a spring (k = 40 N/m) as shown in the figure above. The other side is connected to the block m2 = 3.6 kg that hangs vertically. The system starts from rest with

268. english llit

I am still trying to figure out the meter in the poem On the Amtrak from Boston to New York City. Looking at the types of meter I narrowed it down to iambic pentameter and anapestic. I thought the meter was anapestic because of the 2 unaccented syllables

269. PHYSICS HELP

m1 = 2.7 kg block slides on a frictionless horizontal surface and is connected on one side to a spring (k = 40 N/m) as shown in the figure above. The other side is connected to the block m2 = 3.6 kg that hangs vertically. The system starts from rest with

270. Science (Chemistry)

I'm not sure how to do a couple of problems on my chemistry worksheet. Can you please help me? You dissolve 0.00902 g of naOH in enough water to make 1000 mL. What is the Ph of this soultion. What is the molarity, pH, and pOH of 5.00 of naOH in 750.0 mL of

271. Managerial ECON

The chief economist for Argus Corporation, a large appliance manufacturer, estimated the firm’s short- run cost function for vacuum cleaners using an average variable cost function of the form AVC = a + bQ + cQ2 where AVC dollars per vacuum cleaner and Q

272. statistics

provided with data representing the time it took husbands and wives to run a mile. All data are in minutes Husband Wife 8.2 9.7 8.9 8.5 9.7 8.9 9.8 8 10 9 7.9 7.9 6.7 8 8.9 7.9 12.2 9.9 15 10.2 8.8 8.4 8.9 -- 21 10.4 11.3 9.2

273. algebra

EVALUATE 5x-3y ________ for x=3 and y=4 7

274. physics

Two crickets, Chirpy and Milada, jump from the top of a vertical cliff. Chirpy just drops and reaches the ground in 3.10 , while Milada jumps horizontally with an initial speed of 93.0 .

275. Past tense and Present tense in essay

“Antigone” written by Sophocles shows Antigone, the main character as a tragic hero. Antigone is the true tragic hero because she acts without anticipating the consequences of her rebellion, realizes she has made an irreversible mistake only after it

276. algebra

Write a true sentence using either < or> -7.82 -7.802

277. English

I left out the following sentences. Thank you. 1)Of (among?) the toothed whales Narwhal whales are his favourite. They are known for their unicorn-like tusk that grows (springs?) from their forehead, in the male of the species. This can be up to three

278. thesis help

I know I m asking for a lot of work but please if somebody can help me , I would really appreciate it

asked by thesis help
279. logs

log (base 8) 1 = ??? I know it's 8 to some power gives me 1, but I can't figure it out.

asked by help me
280. chemistry

When the equation Fe2(SO4)3(aq) + 3Ba(OH)2(aq) ! is completed and balanced, a term in the balanced equation is 1. 2 Fe(OH)(s). 2. 2 Fe2(SO4)3(aq). 3. Ba2(SO4)3(aq). 4. 2 Fe(OH)3(s).