1. physics

Archer pulls her bow string back 0.4 m by exerting a force that increases uniformly from zero to 230 N. What is the equivalent spring constant of the bow? This is what I did: F = kx 230 N = k(0.4 m) 575 = K My question is this: Is the answer just 575 or is

2. Chemistry

Calculate the pH of (1)0.150M KC2H3O2: (2)0.200M pyridine chloride, C5H5NHCl: and(3) 0.500M NaCl

3. Calculus - Functions?

#1. A cubic polynomial function f is defined by f(x) = 4x^3 +ax^2 + bx + k where a, b and k are constants. The function f has a local minimum at x = -1, and the graph of f has a point of inflection at x= -2 a.) Find the values of a and b #2. Let h be a

4. Physics

During a baseball game, a batter hits a pop-up to a fielder 82 m away. The acceleration of gravity is 9.8 m/s2 . If the ball remains in the air for 6.9 s, how high does it rise? Answer in units of m.

5. history

How did the Vietnam War, and the domestic opposition to it, come to dominate American politics in the 1960s?

6. physics

Some special vehicles have spinning disks (flywheels) to store energy while they roll downhill. They use that stored energy to lift themselves uphill later on. Their flywheels have relatively small rotational masses but spin at enormous angular speeds. How

7. Physics

How do you solve this problem? A ball on the end of a string is revolved at a uniform rate in a vertical circle radius of 72.0 cm, as shown in figure. If its speed is 4.00m/s and its mass is .300 kg. Calculate the tension in the string when the ball is a)

8. calculus

Can someone tell me how to do this type of problem? A particle moves along the curve y=sqrt(1+x^3). As it reaches the point (2,3) the y coorindate is increasing at a rate os 4cm/s. How fast is the x coordinate of the point changing at that instant?

9. Physics

How to solve/ work this problem? If a curve with a radius of 88m is perfectly banked for a car traveling 75 km/h, what must be the coefficient of static friction for a car not to skid when traveling at 95km/h?

10. world history

How did the Renaissance contribute to the Age of Exploration? by emphasizing the importance of converting people to Christianity by awakening a spirit of discovery and innovation in Europe by fostering a belief in the importance of working as a group by

11. statistics

Suppose a basketball player, Player A made 80% of her free throws last season and that she continues to shoot free throws at the same rate. Assume that free throw attempts are independent. Let the random variable X be the number of free throws that player

12. College Algebra

A farmer wants to build a rectangular fence using the side of his barn as one side. He has 200 yards of fencing available. Find the maximum possible area he can enclose with the fence.

13. Chemistry

The intravenous dosage of mannitol is 1.5g/kg, administered as a 15% mv solution. How many ml of the solution should be administered to a person with a body mass of 85kg?

14. history

How and why did the American economy soar from 1950 to 1970?

15. physics

A transverse wave, frequency 15.0 Hz, travels along a string. Distance between a crest and an adjacent trough is 3.50m. What is its wavelength?

17. Math-Statistics

It appears that people who are mildly obese are less active than leaner people. One study looked at the average number of minutes per day that people spend standing or walking. Among mildly obese people, minutes of activity varied according to the N(373,

18. chemistry

A particular kind of emergency breathing apparatus-often placed in mines, caves, or other places where oxygen might become depleted or where the air might become poisoned-works via the following chemical reaction: 4KO2(s)+2CO2(g)--> 2K2CO3(s)+3O2(g) Notice

19. Physics-Optics

A point source of light illuminates an aperture 4.00m away. A 18.0 cm -wide bright patch of light appears on a screen 2.00m behind the aperture. I have been trying to use the equation w=(2*wavelength*distance)/aperature width. However, I am not given

20. Physics

A parallel-plate capacitor is constructed from two circular metal plates or radius R. The plates are separated by a distance of 1.2mm. 1. What radius must the plates have if the capacitance of this capacitor is 1.1 uF? 2. If the separation between the

21. physics

A high diver leaves the end of a 5.0 m high diving board and strikes the water 1.4 s later, 2.8 m beyond the end of the board. Considering the diver as a particle, determine the following. (a) her initial velocity, v0 1 m/s 2° 3 (b) the maximum height

22. General Chemistry

Methanol is produced as the sole product of the combination of carbon monoxide gas and hydrogen gas. If 3.12X103 kg of methanol are actually produced, what is the precent yield if you start with 430.0 kg of hydrogen gas?

23. science

The following is current scientific evidence supporting the nebular theory on the formation of the solar system.' a the composition of the inner and outer planets, current observations of star formation, and the motion of the solar system b current

24. Physics

Please, help me with this problem... im a bit confused abt solving it.. In a tank of volume V=7.5 L, temperature T=300 K, there is a mix gases: n1=0.1 mole of oxygen, n2=0.2 mole of nitrogen, n3=0.3 mole of carbon dioxide. Considering the gases ideal,

25. medicla terminology

what are the benefits and disadvantages of using medical terminology in medical office management?

26. chemistry

A particular kind of emergency breathing apparatus-often placed in mines, caves, or other places where oxygen might become depleted or where the air might become poisoned-works via the following chemical reaction: 4KO2(s)+2CO2(g)--> 2K2CO3(s)+3O2(g) Notice

27. calculus

Consider the graph of y2 = x(4 − x)2 (see figure). Find the volumes of the solids that are generated when the loop of this graph is revolved about each of the following

28. Physics

‎1. A 3kg body moving towards the east with a speed of 5 m/s collides with a 2kg ball originally at rest. After the collision the 3kg body moves in a direction of 25 degrees N of E. If the collision is perfectly elastic Find: a) the magnitude and

29. Physics

The two blocks in the figure are connected by a massless rope that passes over a pulley. The pulley is 17 in diameter and has a mass of 1.9 . As the pulley turns, friction at the axle exerts a torque of magnitude 0.40 . If the blocks are released from

30. physics

A book on a shelf 2.0 meters above the floor has a mass of 1.5 kilograms. What is the gravitational potential energy of the book?

31. Statistics

A sociologist is testing the null hypothesis that the percentage of school superintendents who earn an annual salary of more than \$150,000 is greater than or equal to 50%. The sociologist conducts a poll of 1100 randomly selected superintendents and finds

32. Physics

How to solve/work problem? Two objects attract each other gravitationally with a force of 2.5 * 10^-10 N when they are .25m apart. Their total mass is 4.0kg. Find their individual masses.

33. Chemistry

You have a stock solution of 14.4 M NH3. how many mililiters of this solution should you dilute to make 1050mL of .220 M NH3 answer 16.o mL Question if you take a 10.5mL portion of the stock solution and dilute it to a total volume of .600L, what will be

34. Physics

Use the relationship power = current voltage to find out how much current is drawn by a 1350 watt hair dryer when it operates on 120 volts. Then use Ohm's law to find the resistance of the hair dryer.

I need an advertisement which hasn't been banned yet, but that you think should be banned. I don't really pay attention to ads, so I don't know which ones should be banned. I actually have to write a complaint letter on one.

36. US History

Why was control of the seas so important for the Allies and the Axis?

37. chemistry

How many grams of solid KOH are needed to prepare 100.mL of a 1.7 M solution?

38. physics

Calculate the impulse that must be imparted to stop a 5.0kg object traveling at 8.0 m/s? If the object came to a stop in 10 s, what is the magnitude of the stopping force?

39. Chemistry

Calculate the pH of (1)0.150M KC2H3O2: (2)0.200M pyridine chloride, C5H5NHCl: and(3) 0.500M NaCl

40. physics gr 12

A flower pot is dropped from the balconey of an apartment 28.5 metres above the ground. At a time of 1 second after the pot is dropped a ball is thrown vertically downwards from the balconey one story below 26 metres above the ground. The initial velocity

41. Physics

The gravitational force between two objects is proportional to what

42. chemistry

Combustion analysis of 1.200 gram of an unknown compound containing carbon, hydrogen, and oxygen. What is the empirical formula of the compound?

43. Math, Stats

the probability is 0.6 that a person shopping at a certian store will spend less than \$20. For group of size 19, find the mean number who spend less then \$20.

44. Geometry

A wheelchair ramp has a rise from the ground of 1 gilt. The ramp has a length of fourteen feet. To the nearest angle the ramp makes the sidewalk

45. Physics

How do you solve this problem? How fast (in rpm) must a centrifuge rotate if a particle 9.00cm from the axis of rotation is to experience an acceleration of 115,000 g's?

46. chem

Complete the table below: Answer the following for a body centered unit cell. (Hint: Helpful information can be found by going to the "Lattice" menu, choosing "Cubic", and then choosing "Body-Centered" in the Crystalline Solids program.) Crystalline Solids

47. Chemistry

How many mL of a 10.0% by volume stock solution of HCl must be diluted with enough water to make 300.mL of a 1.5% by volume solution?

A hospital performs 3 types of operations. The first type takes 30 minutes, and they charge \$700 for it. The second type takes 1 hour, and they charge \$1050 for it. The third operation takes 2 hours, and they charge \$1400 for it. The hospital can schedule

49. History

If you could summarize the fighting in the Soviet Union between 1941 and 1944 into one sentence what would you say??

50. Math

A department store is holding a drawing to give free shopping sprees to two lucky customers. There are 15 customers who have entered the drawing: 4 live in the town of Gaston, 6 live in Pike, and 5 live in Wells. In the drawing, the first customer will be

51. Numerical Analysis

Using the bisection method, Newton’s method, and the secant method, find the largest positive root correct to three decimal places of x3 − 5x + 3 = 0. (All roots are in [−3,+3].)

52. Physics

In the figure below, two blocks are connected over a pulley. The mass of block A is 12 kg, and the coefficient of kinetic friction between A and the incline is 0.22. Angle θ is 30°. Block A slides down the incline at constant speed. What is the mass of

53. Calc

If the substitution u=x^2 + 1 is made, then the integral from 0 to 2 of [(x^3)/(x^2 + 1)]dx = ? Thank you for your help!

54. chemistry

assume the diameer of a neutral helium atom is 1.40 x 10 to the second power pm. suppose that we could line up helium atoms side by side in contact with one another. how many atoms would it take to make the distance from end to end 9.00cm

55. physics

Planet A and planet B are in circular orbits around a distant star. Planet A is 8.0 times farther from the star than is planet B .What is the ratio of their speeds ?

56. physics

A snowboarder of mass 74.4 kg (including gear and clothing), starting with a speed of 5.0 m/s, slides down a slope at an angle è = 37.1° with the horizontal. The coefficient of kinetic friction is 0.116. What is the net work done on the snowboarder in

57. World Geography

Which statements describe the European Union (EU)? 1) Citizens of EU nations can live, work, or study in any member nation. 2) Passports must be presented by citizens when traveling between EU nations. 3) Tariffs between member nations were ended in 1968.

58. physics

Estimate the speed of the parachutist descending at the constant velocity with open parachute. Assume the area of the parachute, A = 30 m^2, mass of a person, m = 100 kg, and density of air, roh = 1 kg/m^3. Enter the answer limited to the second decimal

59. Physics

What thrust does a 350 model rocket need in order to have a vertical acceleration of 14.0 on the Earth?

60. math

What is the expanded form for 17,500 mph

61. math

Having trouble with these pairs of numbers (20,21,29) - (28,45,53) I am supposed to develop a Pythagorean triple. Here is that I am supposed to use which is a formula that can be used to generate infinite number of generating Pythagorean triples is: a =

62. chemistry

how many moles of gas are contained in a 50.0L cylinder at a pressure of 100.0 atm and a pressure of 35 C?

63. Physics

"An alpha particle (a helium nucleus) is traveling along the positive x-axis at 1 250 m/s when it enters a cylindrical tube of radius 0.500 m centered on the x axis. Inside the tube is a uniform electric field of 4.50 X 10^-4 N/C pointing in the negative y

64. math

what fraction of a week is 7 seconds A) 1/24 B)1/1440 C) 1/3600 D) 1/86400

65. Physics

How long will it take a 1080 W motor to lift a 330kg piano to a sixth-story window 16.0m above?

66. math

The mean radius of the Earth is 6.37 x 106 meters (m). Assuming the earth can be modeled as a perfect sphere a. In cubic meters (m3 ) what is the volume of the Earth? b. In meters (m) what is Earth’s circumference? c. If the mean density is 5.515g/cm3,

67. algebra

Solve using the elimination method. Show your work. If the system has no solution or an infinite number of solutions, state this. -5x – 7y = 25.5 -2x + 10y = -9

68. physics

A communications satellite is in a synchronous orbit that is 3.00 107 m directly above the equator. The satellite is located midway between Quito, Equador, and Belem, Brazil; two cities almost on the equator that are separated by a distance of 3.10 106 m.

69. Pre-cal/Trig

(tan/(1+sec)) + ((1+sec)/tan) = 2csc (Show all work please.)

70. World cultures

What are the five main regions of Africa? I looked it up but, all of them say south, north, central, west, and east Africa

71. physics

Micah and Will watched a skater skate at a steady speed around a oval rink.Micah said the skater had no acceleration.Will said that the skater was accelerating.Who is right?Explain your reasoning.Be sure to describe how the skater's motion and velocity

72. Chemistry

What mass of Cr(OH)3 would be produced if 500ml of 0.250M KOH were added to a solution of CrCl3. I need to understand how to set this up, not just get the answer. I have the balanced equation figured out.

73. Algebra

The \$75 cost for a party was to be shared equally by all of those attending. Since five more people attended than was expected, the price per person dropped by 50 cents. How many people attended the party?

74. english 101

how do you plan to support this thesis on healthy eating

75. Socialogy

a. How can social stratification possibly lead to prejudice and/or discrimination towards others? b. Compare and contrast prejudice and discrimination in at least three different ways. c. How can the three sociological perspectives (i.e., social

76. Art

Hi- I have to do an Art analysis on 'Diamond Dust Shoes' by Andy Warhol, and am a bit stuck on the part "what do you think the artist was trying to say?" I am in yr 8, and was wondering if anyone had any suggestions :) Thank you!

77. physics

the coefficient of restitution between the ball and the floor is 0.60 If the ball is drop from rest at the height of 6.6 m from the floor. Find a) what is the maximum height will the ball attain after the first bounce. b) how much kinetic energy is lost

78. english

do you have a section on writing a research paper in mla format

The diagonals of a rhombus ABCD intersect at point E. If the sides of BC is equal to x + 9 and side DC is equal to 5x-2, find x. How would I set this up-Please give me some direction

80. MATH

In Jessica's art class, the ratio of girls to boys is 3:2. If there are 25 students in the class, how many more girls are there than boys?

81. Algebra 2

I am having trouble with my last two word problems on a homework assignment. For some reason I just can not get word problems and get frusterated. I hope someone can help. Alan was able to rent a moving van for \$99 with unlimited mileage or \$49 plus .80

82. physical science

If 22 grams of water are saturated at 75 degrees celsius with potassium nitrate and then cooled to 40 degrees celsius, how much will precipitate?

83. Chemistry 11

Calculate the number of moles of Carbon in 27.6g C4H9OH.

how does Eudora Welty use dialogue to establish characters and character relationship in A Visit of Charity?

85. Smartphone Help

This is an assignment in which I have to list down Requirements, advantages, and disadvantages of a smartphone. These are the requirements needed. -send and receive phone calls -send and receive texts -on screen keyboard or physical keyboard -can tether a

86. chemistry

for our lab, we are given the molarity of ClO-. We are then supposed to use beer's law to determine the molarity of the dye that was used to make the solution with. For the dye, use the first absorbance value, Ao, and calculate the initial concentration of

87. physics

1. A solid copper cylinder hangs at the bottom of a steel wire of negligible mass. The top end of the wire is fixed. When the wire is struck, it emits sound with a fundamental frequency of 300 Hz. The copper cylinder is then submerged in water so that half

Given the numerical values shown for the function f(x), find approximate values for the derivative of f(x) at each of the x-values given. x= 0 1 2 3 4 5 6 7 8 f(x)= 13 15 16 17 17 14 11 9 7 f'(x)= 2 1 1 1 0 -3 -3 -2 -2 What seems to be the greatest rate of

89. math

A cylinder has a diameter of 80 cm and a length of 45 cm. Another cylinder has the same volume but is 80cm long. What is the diameter of the longer cylinder?

90. FRENCH

COuld you please tell me if Ive translated these French words and phrases right? Est-ce qu(e) - Phrase introducing a question Ne Quitte pas - Wait a minute? Maintenant - Now Il y a des defiles et beaucoup de bals: -There are some parades and many dances Ce

91. physical

I hv been try to do but...calcu the GPE of a roller coaster car points B is 5m/C 3,2m nd C 9,8 also D...

92. statistics

Ms. Kim Mooney in 1989 as part of completing her dissertation at UNH. The dataset was collected to assist in exploring the relationship between the “effect of social stress on blood pressure.” This was investigated by collecting data at six different

93. geometry

The rectangular label will completely cover the lateral surface of the can using as little paper as possible. If the can has a height of 8 cm and a diameter of 7 cm, then what are the width and length (to the nearest centimeter) of the label?

94. Physics

Three weights are attached to the corners of an equilateral triangle (side length 10 cm) made from stiff but very light wire. Measured from the bottom left corner, what is the center of mass of this object if M1 = 0.1 kg, M2 = 0.2 kg, and M3 = 0.3 kg?

95. Elements of University Composition and Communicati

Each of the following sentences has one grammatical error. The errors are in one of the following four categories: subject–verb agreement, run-on sentence, verb form and tense, or sentence fragment. Read each of the sentences and write the type of error

I need an advertisement which hasn't been banned yet, but that you think should be banned. I don't really pay attention to ads, so I don't know which ones should be banned. I actually have to write a complaint letter on one. Advertising-HELP - Kate,

97. Pyschology

what does this mean? psychology is uniquely qualified to help intervene? I also would like you to comment on what are at least two key ways psychology is uniquely qualified to help intervene.

98. Algrebra

How do you write the rule for: y=3x+4 for x=8

99. Algebra

Solve using the substitution method. Show your work. If the system has no solution or an infinite number of solutions, state this. x + 10y = 41 x + 9y = 37

100. Math, Stats

the probability is 0.6 that a person shopping at a certian store will spend less than \$20. For group of size 19, find the mean number who spend less then \$20.

101. health

what are 9 parts of the female and male reproductive system that are either exactly the same of similar

102. English

I am writing a paper and am wondering what the proper way is to write a sentence from a different language and then to put a translation. For example: My aunt said, "mune pani joveche" (I want water). Would that be the right way to write it?

a collision between two pucks on an air-hockey table. Puck A has a mass of 0.025 kg and is moving along the x axis with a velocity of +5.5 m/s. It makes a collision with puck B, which has a mass of 0.060 kg and is initially at rest. The collision is not

104. trigonometry

how can i find the anti-logarithm of this number. 5.07843058944 it should be 59477.5 can show me how.

105. Math

what is 210-x=100 ?

106. math

Simplify as indicated. State at least one property of multiplication or division that would prove your simplification process correct. a. –(n + 4), to eliminate the parentheses b. 6(-s), to eliminate the parentheses c. 8(24 – n), to eliminate the

107. algebra

You are planning to spend no less than \$6,000 and no more than \$10,000 on your landscaping project. Write an inequality that demonstrates how much money you will are willing to spend on the project.

108. Physics

How long will it take a 1080 W motor to lift a 330kg piano to a sixth-story window 16.0m above?

109. Physics

How long will it take a 1080 W motor to lift a 330kg piano to a sixth-story window 16.0m above?

110. math

A 4-story house of cards requires 24 cards. How many cards are required to build a 98 story house of cards?

111. ELA

Can you check if this essay has some corrections that need do be fixed: Imagine you're talking on your telephone or even sending an email to your friend and the government is listening to your conversation or what you’ve written to your friends. Does

112. Kinesiology

Assume that a muscle is having a force of 300N is pulling at an angle of 75 degrees. What are the components of the force both the trigonometric method and graphic method.

113. Math

A room is in the shape of a right triangle. The hypotenuse is 8 meters longer than the short leg and the long leg is 4 meters longer than the short leg. Find the length of each side. (ok, now how can it be done if I change each side to cm and km, then ft

114. Math

Penny has been hired to paint 5 bulletin boards at her school. To calculate the amount of surface she needs to paint, she multiplies the length of one side of one bulletin board by itself and then multiplies the product by 5. Based on Penny's calculations,

115. Physics

I'm trying to help my 7th grader with homework and I don't know this stuff. How do you figure word problems based on newton's 2nd law. one problem is: What is the acceleration of a ball if a force of 20N is applied to the 8kg ball?

116. econ

Suppose Jean Splicer, an investor, buys \$100,000 of shares of stock in a diversified bundle of Bio-tech firms and exactly one year later sells those shares for \$108,000. If the value of the CPI at the date of Jean's purchase was 160, and rose by the sale

117. Math Trivia

1) A school has 1-- closed lockers. Larry comes into the school and "toggles" every second locker, then Fred toggles every 3rd, Bob every 4th, etc, up to Zoe who toggles every 100th locker. After all this"toggling" how many lockers are open? 2) If you take

118. Science

What type of plate boundary is located at the Juan de !@#\$%^&a plate and Washington state on the north American plate?

119. math

Write and solve the number sentences she could use. Ms. Cloudcover, the TV weatherperson, noted that Sunday’s temperature was 12, much warmer than the -7 on Friday and the -2 on Saturday. She remembered that Thursday’s temperature was 0 and checked to

120. Physics

Please help ~ Two blocks are arranged at the ends of a massless string as 3.21 kg (box hanging from table) 4.96 kg (box on table). The system starts from rest. When the 3.21 kg mass has fallen through 0.4 m, its downward speed is 1.27 m/s. The acceleration

121. Chemistry

Ni+2 + SCN- Ni(SCN)+ A reaction flask initially contains .0006 Ni+2 and .00002 M SCN-. AFter equilibrium is reached, it is found that the concentration of Ni(SCN)+ is 6.0x10^-6 M. Complete an ICE box table.

122. Cost acconting

(underapplied or overapplied overhead) At the end of 2010, jackson tank company's accounts showed a 66,000 credit balance in Manufacturing Overhead control. In addition, the company ahd the following account balances: Work in process inventory 384,000

123. Physics

A 100.0 W light bulb hangs from the ceiling. What is the visible light intensity on the floor, 2.1 m directly below the bulb, if 10% of its output is visible light? So I am attempting to use: I= Power/area however, I don't have a radius. I know 10% of 100

124. Chemistry-help needed

Can we use an ACS/AR grade chemical for UV spectrophotometric analysis? Or is it a must to use a chemical that is specially designated (SpectrAR grade) for UV analysis?

125. physics

A 10-kg duffle bag is undergoing a vertical acceleration of 0.65 m/s2 (positive for up, negative for down), while its owner is holding it with an upward force. What is the magnitude of this force?

126. trigonometry (MathMate)

MathMate i would really appreciate if you can show me where the logarithms can be used.I know they are unnecessary and I already found the answer without them but i still have to show my work using logarithms and they just confuse me. I also have most

127. calculus

equation of the tangent line to the curve y = 2x²-x+10 at the point (-1,13)

128. Math

Ues the Gaussian elimination to find complete solution to the equation or show that none exist 5x+12y+z=10 2x+5y+2z=-1 x+2y+-3z=5

129. Science

A liquid has a volume of 100mL. It is placed into a different container and its volume is 1L. What can you conclude about how this liquid changed?Explain.

130. trigo

in a right triangle XYZ where right angle at angle X, if z= 14 and angle Y = 27.7 degree. Find angle Z, side x and side y.

131. geometry

Two cyclists set off at the same time from a point o .Cyclist p head east with a velocity of 20km/hr. Cyclist Q heads with a velocity of 16km/h .After 45 min they both stop calculate a) the distance they have each travelled in 45 min . b) the distance ox

132. math

Calculate the answers |-3-|-7-7|| Does |n+m| = |n|+|m| for all integers na and m? If so, give some examples. If not, give a counterexample. The Weathertalk Analysis Problem. Read the following story about the TV weatherperson and identify as many places as

133. math

Write the integer that is represented by a point midway between -76 and 76 on the number line. Choose a nonzero integer for n to show that –n can be evaluated as a positive number. Scoring in Golf. A golfer played 8 rounds on a tournament course with the

134. Math

What is a reasonable estimate of the perimeter of the base that is a square with all 4 sides 143.5 meters,

135. Physics

A 5 kg block is attached via a rope to a dangle 2kg mass. Consider the case without friction. What angle would the ramp be for the 5kg block to experience zero acceleration?

136. math

What is the area of a circle with d=22?

137. calculus

y = log7(x^2 - 6x - 2) this is base seven is the answer 2x-6/(x^2-6x-2)

138. Geography check

The Zambezi River runs through the easternmost part of this country...is it Zambia?

139. Math

how many positive three-digit numbers are there that have no digits repeating?

140. algebra

Write the equation in y=mx+b form. Find the equation of the line that passes through the points (8,-15) and (-2,5) I am unable to get this answer!

141. algebra

Solve using the elimination method. Show your work. If the system has no solution or an infinite number of solutions, state this. -3x + 6y = -3 / -6x + 4y = -10

142. chemistry

what is 2.5% vapor expressed in parts per million?

143. science/chem

Hund's rule states that each orbital in a sublevel will contain one electron before another electron will fill an orbital? Why?

144. Science-math

Calculate the density of 25 Grams at a volume of 10 millimeters

145. Physics

If the angle of incidence is 30 degrees, what is the angle of reflection?

146. Computer class

how do I design a program using a flowchart, the program needs to compute state and county sales tax? It is suppose to compute it once the user enters amount of purchase

147. English

I really hope you can have a look at my sentences. I forgot to include these last ones. 1)Describe the details of Winston Smith's life as they appear in the opening (?) to George Orwell's 1984? 2) Why can Orwell's 1984 be considered as an anti-utopian

Why is it helpful to use "occupational clusters" in thinking about a career?

149. physics

1) a loaded cart with a mass of 96 kg sits at reat atop a 40 degree inclined plane that measures 20.5m long. accidentally the cart starts so to roll down the inclined plane with a frictional force of 5550N working against it for the intire 20.5m.

150. Physics

A 5 kg block is being pulled to the right with a 20 N force. This causes the block to slide along the table with an acceleration of 2 m/s2. What is the coefficient of kinetic friction between the block and table?

151. Physics

A lower block is being pulled to the right across a wooden table and it is 5kg and the block on top of it weighs 2 Kg. The friction between the table and the lower block is reduces the total acceleration to be 1.5 m/s2. Friction keeps the upper block

152. Physics

A block is sitting on a ramp. The block feels a force of friction sufficient to keep it from sliding down the ramp, which makes an angle of 30 degrees w.r.t. horizontal. What is the minimum coefficient of static friction between the block & ramp?

153. Physics

A 5 kg block is being pulled to the right by a rope which is attached to a dangling 2 kg mass. The coefficient of kinetic friction between the mass & table is 0.1 What is the tension in the rope?

154. maths

Can anyone help with te following please The total volume V(x)cm^3of a container is given by V(x)=4(x+ãx(8-x)) (

155. physics

A 3.3 kg brick is falling at a rate of 35.1 m/s toward the earth at a current height of 14 m. What is the total mechanical energy of the brick?

156. Math

4a-1-2a = 5+3(2a-6)

157. english 101

review the concept of fallacies and suggest ways to avoid fallacies in your expository essay on healthy eating.

158. Math

Suppose that the number of bacteria in a certain population increases according to an exponential growth model. A sample of 2600 bacteria selected from this population reached the size of 2873 bacteria in two and a half hours. Find the continuous growth

159. pre algebra

how do you solve 10(-2x+1)=19(x+1)

14-x=-8x+42

161. Kinesiology

Assume that a muscle is having a force of 300N is pulling at an angle of 75 degrees. What are the components of the force both the trigonometric method and graphic method.

162. science

what is a dependent varible

163. Calculus

find the derivative of 4x(lnx+ln9)-9x+e

164. algabra

Write a quadratic equation in the variable x having the given numbers as solutions. Type the equation in standard from, as^2+bx+c=0 the solutions are (-3,1)

165. abnormal psychology

Rani is a member of a tribe of Indians in the rain forest of south america.The tribe's witch doctor believes that Rani is possessed by the spirit of a demon wolf and in order to be cured he must undergo an exorcism.Which type of explanation of

166. chemistry

Calculate the pH in a 0.00500 solution of NaOH.

167. physics

A physics professor lifts her 8.2-kg briefcase at constant speed with an upward force. Find the magnitude of her force. answer in newtons.

168. Chemistry

For the weak acid HX, what is the pH of a 0.10 M solution if the acid is 4.0% ionized?

4. List at least three steps that make-up a workable plan and explain why each is important.

170. Math

4a-1-2a = 5+3(2a-6) AND 3(10+4y) = 6+6y

171. Calc

Let f(x) = x^3 - 7x^2 + 25x - 39 and let g be the inverse function of f. What is the value of g'(0)?

172. algebra 2

A electrician charges \$50 for the first half-hour of work and \$30 each hour for additional time. Stoney Point High School budgeted \$200 to repair the refrigeration system. What length of service call with the budget not be exceeded?

173. physics

1.A stone fired straight upwards from the top a 50m high bridge fall into water below it 12seconds later.what was its initial velocity? how high above the bridge did it go?

174. physics

thanks for solving my question pasted on dated 18.02.2011 at 10.20.pm.2nd question. a wt lifter lifts a wt of one kg against force of gravity through a distance of .8 mtr. how much cals he will burnt from the food he had taken.

asked by ajmer singh sidhu ludhiana
175. GEOMETRY

The present height of the pyramid of Khafre in Egypt is 137m.An engineer surveying pyramid measures an angle of elevation of 33degrees from a point X to the top of the pyramid. Calculate the distance from X to the cenre of the base of the pyramid at Y

176. English

Can you please check if these sentences are possible? Thank you. 1) Refer then to the episodes which lead to the abolition of slavery. 2)Lord Henry is a symbol of hedonistic and decadent upper classes, despising the Victorian virtues of work and morals,

177. math

Simplify as indicated. State at least one property of multiplication or division that would prove your simplification process correct. a. –(n + 4), to eliminate the parentheses b. 6(-s), to eliminate the parentheses c. 8(24 – n), to eliminate the

178. art

Explore the daguerreotype process at The Metropolitan Museum of Art website: In your opinion, what is the most significant difference between the daguerreotype process and modern photography? How do early and modern photos differ in the creative process of

179. math

if today is tuesday and i first bent over backwords 563 days ago, then on which day did I first bend over backwords? sat,wed, tues or friday?

180. abnormal psychology

Which one of the following is an essential feature of the impulse-control disorders? A)Ability to control the impulse B)Pride after committing the impulsive act C)Sense of calm prior to committing the act D)Pleasure after acting on the impulse Is D correct

181. French

If you're writing a sentence in French with two verbs, the first being l'imparfait, would the second one be in the infinitive? For example "Le peuple prehistoriques était intelligente parce que ils pouvaient ériger les monuments sans des machines" ? Is

182. Life orientation

Identify 5 practices in contravention of the basic conditions of employment act?

183. US History

Glorification of war in theory would be that it can change society, and make people better. but what would it be in Practice:??

184. English

I included only 4 sentences for you to check. Thank you. 1) Refer then to the episodes which lead to the abolition of slavery. 2) He provides us with several epigrams –short and clever amusing sentences – which express his idea in a clever and amusing

185. trig

Suppose that q is in standard position and the given point is on the terminal side of q. Give the exact value of the indicated trig function for q.

186. Cuban culture

I tried googling this and I can't find anything. What makes Batidos (Cuban milkshake) special in Cuba?

187. intermediate algebra

Select the set of equations that represents the following situation: Mike invested \$706 for one year. He invested part of it at 5% and the rest at 3%. At the end of the year he earned \$28.00 in interest. How much did Mike invest at each rate of interest?

188. algebra

addition method:3x-5y=-2 and 5y-2x=-2 how would I solve it since they are not together?

189. Algebra 1

Two lines L1 and L2, are perpendicular. The equation of L1 is 3x-y=2. L2 passes through (-5, -1)

190. math

What is the area of each circle? 1. d = 42 2. d = 17

191. statistics

57, 61, 57, 57, 58, 57, 61 What is the mean My answer 408/7=58.285=58.286 answer is 58.286

192. Geoscience

can you help me write out a geological time scale of an area located within stone mountain Georgia? I need a description of the area, how the rock transformed and was dated, picture of a map that has the longitude and latitude of the area picked, the

193. abnormal psychology

Rani is a member of a tribe of Indians in the rain forest of south america.The tribe's witch doctor believes that Rani is possessed by the spirit of a demon wolf and in order to be cured he must undergo an exorcism.Which type of explanation of

194. physics

When your car is moving at 3.33 m/s and car has a mass of 860 kg, how much translational kinetic energy does it have?

195. math

5000 to the power of 5

196. Anthropology

Why is there a conflict between evolutionists and creationists?

197. Social studies

Pro and Cons b/w a principal and the president

198. Physics

A car travels around a circular track (4 km diameter). Its tires have frictional coefficients: mS = 0.3 & mK = 0.2. If the track is flat, how fast can the car travel around the track and still maintain control?

199. Physics

The gravitational constant for Earth is gE = 9.8m/s2. The gravitational constant for the planet Mongo is 20 m/s2. If an object has a mass of 10 kg on earth, what is its mass on Mongo?

200. Physics

The gravitational constant for Earth is gE = 9.8m/s2. The gravitational constant for the planet Mongo is 20 m/s2. If an object has a weight of 10 lbs on earth, what is its weight on Mongo?

201. precalculus

Hi does anyone know how to solve this equation into parabola form? thanks x^2 + 2xy +3y^2 = 9

202. Math

4a-1-2a = 5+3(2a-6)

203. heart

how long does it take to design, test, and get FDA approval of an artificial heart valve?

204. pre algebra

how do you solve 10(-2x+1)=19(x+1)

205. pre algebra

how do you solve 10(-2x+1)=19(x+1)

206. English

I need to know which alternatives (?) sound best. Thank you. 1) Describe what living and working conditions for slaves in 19-th century America were like. Refer then to when slave trade was banned from US (or the United States or America). 2)Describe the

207. physics

A boy travels in a boat at angle of 30 degrees to the river bank.if he travels 250m before reaching the opposite,calculate the width of the river

14-x=-8x+42

209. english

Please explain usage of " ATLEAST "in degrees of comparision.

210. Stats

If the true population standard deviation was known to be 3, then approximately what minimum sample size would you need in an SRS (simple random sample) if you want a confidence interval for the margin of error of .5 or less?

211. precalc

If is vector a ia 7 units long, the magnitude of vector b is 10 units and the cosine of the angle between the two vectors is -0.3 when they are placed tail-to-tail, what does the inner product of vector a and vector b equal?

212. algebra

The final grade for a particular course is calculated by dividing total points earned by total points available. There are 120 points available in the first half of the course, and 140 points in the second half of the course. If a student earns 81% in the

213. physics

A string is tightly stretched between the point A-G at point C it's lightly pinch and point B it's plucked, at points DEF are light folded tissue paper the segments A to BB to CC to DD to E and EG are all equal in length, what happen to the tissue paper

Find the derivative of the function. g(u) = (5+u^2)^5(3-9u^2)^8 Could someone please explain the steps that would lead me to the answer? I'm completely stuck.

gcf of 8/2

216. trigonometry

1. Finde the area of the following tringles: (use Logarithms) A) a=12.7, b=21.5, c=28.6. i'm not of the answer i got. i got 127.6 if you got something different can you show me how you did while using logarithms.

217. physics

to find velocity v? c=3*10^8 0.99=(1-v^2/c^2)^1/2

218. economics

where can I find current gross domestic product percentages to consumption, investment, defense and foreign trade for Germany & Switzerland for the past five years so I may analyze the info

219. English

It contains 15% sulphates and 30% chlorides. Is this sentence grammatically correct?

220. Calc

If n is a positive integer, find the limit as n approaches +∞ of 1/n(sin (π/n) + sin (2π)/n + ... + sin (nπ)/n)

I didn't read a book for reading and i need to do a clue map stating the clue and what suspect it lead to.. help! the book is Nancy Drew and the Mystery of the Glowing Eye.

222. geometry

if ac = 2x + 13 and db =4x - 1, what is db

223. Networking

I need to design a fully switched network for a 3-story retail building. Management on second floor (36 workstations), Sales on the 1st floor (20 workstations) and warehouse in the basement (35 workstations). My SOW and Network diagrams must consist of the

multiplying a number by 6/4 is the same as dividing it by? is it 3/2 or 4/3

225. Math

To find out hw much inches are in 9.5 feet, do I do 12 times 9.5? I would do that because there is 12 in. in a foot.

226. french

ok my assignment is find a french music video and put speach bubbles in the video and also explain the meaning of the video. ok my music video is "Juste Une Photo de Toi" and i got the speech bubbles working but i don't know what the video mean. here what

227. Science

Ok, so I'm doing a project on the Earth's layers, and I just have a question on the model. DOES IT HAVE TO BE 3-D? If it is, I'm dead meat.

228. English

I urgently need you to check these sentences. Thank you. 1) Describe what living and working conditions for slaves in 19-th century (after 1810) America were like. Refer then to when slave trade was banned from US. 2) The vast majority of African Americans

229. Math

If the sides of a triangle are x, x+5, 2x+5. For what values of "x" would the triangle have a perimeter of at least 72?

230. Elementary Statistics

WHAT ARE THE BOUNDARIES OF 77.5 OUNCES?

231. psychology

explain the relationship between learning and memory.

232. math

What is the area for each circle? 1. d = 22mm 2. d = 17m

233. Biology

Can Someone please trace a molecule of O2 in extreme detail from the air to the a muscle cell in the left calf?

234. grammar

What is the adverb in the sentence I finally finished the report

235. math

2/x+3 = o solve for x. Is this where I go: 2= 0 x+3=0?

236. SmartPhone Help

Blackberry torch 9800: Present three alternative choices from three different carriers and three different manufacturers. All must have the requirements listed below. Phone Name/Carrier Blackberry Torch 9800(I have no idea what is meant by Carrier) These

237. science

what is an explanation for the relationship between currents and the brightness of a light bulb??

238. chemistry

write a balanced equation between sodium and water. if 1.2g of sodium reacted with water, calcul;ate the volume of gas produced at s.t.p. how many molecules of the gas are produced at s.t.p.

239. calculus

Are y=log(x+1) and y=10^x-1 symmetric about the line y = x ?

240. phy

It is a lab question. For a standard stove top element, theoretically determine how long it will take to cool down toroom temperature from the high setting. Compare to experimental values. We have to used conduction, radition and convection

241. Science-math

Calculate the density of 25 Grams at a volume of 10 millimeters

242. science/chem

Why do the d and f block elements have only 2 valence electrons?

243. Science-math

Calculate the density of 25 Grams at a volume of 10 millimeters

244. math

Does anyone know how can I apply the Pythagorean Theorem to real world situations.

245. English

Finsh the sentence. The teenager spoke with the URBANE refinement of a person who..

246. com 150

pick out 3 professions or well-known companies that would highly benefit from having a employee who is well -trained in the art of expository writing.

247. United States 1700s

How did the colonists across colonial boundaries become more aware of and interconnected with each other during this period 1700-1776? kind of like which events of closeness lead to the declaration of independence?

248. math

Francisco has \$2000. He invested part at 7% and the rest at 12%. If his annual return was \$215, how much did he invest at each rate?