# Questions Asked onFebruary 21, 2010

1. ## physics

You throw a 20-N rock vertically into the air from ground level. You observe that when it is 15.0 m above the ground, it is travelling at 25.0 m/s upward. Use the work-energy theorem to find a) its speed just as it left the ground; b) its maximum height.

2. ## Chemistry

A sample of silver with a mass of 63.3g is heated to a temperature of 384.4 K and placed in a container water at 290.0K The final temperature of the silver and water is 292.4K assuming no heat loss, what mass of water was in the container? the specific

3. ## College Chemistry

A student placed 14.0g of glucose (C6H1206) in a volumetric flask, added enough water to dissolve the glucose by swirling, then carefully added additional water until the 100.-mL mark on the neck of the flask was reached. The flask was then shaken until

4. ## calculus

use a(t) = -32 ft per second squared as the acceleration due to gravity.An object is thrown vertically downward from the top of a 480-ft building with an initial velocity of 64 feet per second. With what velocity does the object hit the ground? This type

5. ## physics-momentum

A 0.145-kg baseball pitched horizontally at 39 m/s strikes a bat and is popped straight up to a height of 31 m. If the contact time between the bat and the ball is 2.35 ms, calculate the average force [exerted by the bat on the ball] during contact. [Let

how much heat does it take to convert 20g of water to steam at 100c?

7. ## physics

Tarzan, who weighs 820 N, swings from a cliff at the end of a 20.0 m vine that hangs from a high tree limb and initially makes an angle of 22.0° with the vertical. Assume that an x axis extends horizontally away from the cliff edge and a y axis extends

8. ## PHYSICS

which dam must be stronger, one that hold back 100000 m^3 of water 10 meters deep or one that holds back 1000 m^3 of water 20 meters deep

9. ## Math

Assume that the probability is 1/2 that a baby born is a boy. If a couple has two children, what is the probability that both are girls? Assume that births are independent of each other.

10. ## physics

4.80-kg watermelon is dropped (zero initial speed) from the roof of a 25.0-m-tall building. a) Calculate the work done by gravity on the watermelon during its displacement from the roof to the ground. b) What is the kinetic energy of the watermelon just

11. ## geometry

State the negation of the following statement: It is cloudy.

12. ## British Literature

Hello, would anyone be willing to check my answers to the following questions? 1. Identify the poetic element used in the following lines from Percy Bysshe Shelley's poem "Ode to the West Wind." The phrase "Thou who didst waken from his summer dreams/The

13. ## physics

Three charges are arranged as follows: +3 mC located on the y-axis at +15 mm; -2.5 mC located on the x-axis at -25 mm; and +4.0 mC located at the origin. Determine the magnitude of the force acting on the charge located at the origin.

14. ## spanish

Quien es el chico?

15. ## physics

There are two horizontal forces on the 2.0 kg box in the overhead view of Fig. 5-39 but only one (of magnitude F1 = 20 N) is shown. The box moves along the x axis. For each of the following values for the acceleration ax of the box, find the second force

16. ## science (6th)

please use the following terms in the same sentence- invertebrate, vertebrate and placenta. Thank you

17. ## Chemistry

how many joules of heat are lost by 3580kg granite as it cools from 41.2c to -12.9c?

18. ## chemistry

If the initial concentration of AB is .250 M, and the reaction mixture initially contains no products, what are the concentrations of A and B after 75s?of XY after 5.0 X10^1s?

19. ## chemistry

How many grams of water would you add to 1.00 kg of 1.48 m CH3OH(aq) to reduce the molality to 1.00 m CH3OH. Use two sig figs. I get 4.8 * 10^2 grams and its not right. I want to put this up here again to see if there are any errors that could have

20. ## Chemistry

A sample of .234g of carbon is placed in a closed stainless steel bomb with .502g of of oxygen gas. The mixture is ignited giving of carbon dioxide. How many grams of carbon dioxide should be obtained upon combustion?

21. ## world studies

In the movie Mulan, why was it a crime for a woman to enlist in a army?

22. ## physics

If 2.0J of work is done in raising a 180g apple, how far is it lifted?

23. ## Math

How many ways can you arrange 8 different crates on a shelf if they are placed from left to right?

24. ## physics

Tarzan, who weighs 820 N, swings from a cliff at the end of a 20.0 m vine that hangs from a high tree limb and initially makes an angle of 22.0° with the vertical. Assume that an x axis extends horizontally away from the cliff edge and a y axis extends

25. ## chem

What must be the molarity of an aqueous solution of NH3 if it is 4.2% ionized?

26. ## College Chemistry

A student placed 14.0g of glucose (C6H1206) in a volumetric flask, added enough water to dissolve the glucose by swirling, then carefully added additional water until the 100.-mL mark on the neck of the flask was reached. The flask was then shaken until

27. ## Geometry

If a polygon has 33 sides what is a) The sum of the measures of the angles of the polygon? b) The sum of the measures of the exterior angles, one per vertex, of the polygon?

28. ## physics

In Figure P4.30, m1 = 10.5 kg and m2 = 4.5 kg. The coefficient of static friction between m1 and the horizontal surface is 0.60 while the coefficient of kinetic friction is 0.30. Figure P4.30

29. ## Chemistry

Deterioration of buildings, bridges, and other structures through the rusting of iron costs millions of dollars everyday. Although the actual process also requires water, a simplified equation (with rust shown as iron(III) oxide (Fe2O3) is: 4Fe(s)+3O2(g)

30. ## Physical Science

A block of iron is transported to the moon . Which of the following is true 1) Both its mass and weight remain unchanged. 2)Its mass remains the same, but its weight decreases 3)both its mass and weight decreases 4)Its mass decreses, but it weights remain

31. ## College Chemistry

A student placed 14.0g of glucose (C6H1206) in a volumetric flask, added enough water to dissolve the glucose by swirling, then carefully added additional water until the 100.-mL mark on the neck of the flask was reached. The flask was then shaken until

32. ## Chemistry

How much heat is absorbed by a 2000 kg granite boulder as energy from the sun causes its temperature to change from 10c to 29c?

33. ## physics

A hydraulic jack in a gas station lifts a 900kg car a distance of .25cm When a force of 150N pushes a piston through a distance of 20cm Find the IMA (book answer is 80) AMA (book answer is 59) Efficency (book answer is 74%) can you help, I have no idea how

34. ## chemistry

a galvanic cell: A copper electrode is placed in a Cu(NO3)2 electrolyte. An iron electrode is placed in a Fe(NO3)3 electrolyte. a) What will happen to the voltage if sodium sulfide solution was added to the copper solution(I found that CuS(solid

35. ## science

Which of the following materials would not be important to a protozoan? a) enzymes b) oxygen c) water d) blood e) carbohydrates Is is enzymes?

36. ## Math

In right triangle ABC, altitude CD is drawn to hypotenuse AB. If AD equals 4 and AC exceeds DB by 1, find DB. It is from a worksheet about proportions in a right triangle.

37. ## physics

A solenoid is wound with a single layer of insulated copper wire of diameter 2.800 mm and has a diameter 5.000 cm and is 1.500 m long. Assume that the adjacent wires touch and that the insulation thickness is negligible. what is the inductance per

38. ## Physics

A capacitor has square plates, each side a, making a small angle theta with each other. Determine the capacitance C in terms of a, d, and theta. The capacitor may be divided into differential strips which are effectively in parallel.

39. ## math

If 1/2 of the students are girls and 1/3 of the girls have long hair, what percent of the girls have long hair

40. ## chemistry

1)RuO2 is molecular, but why is it insulator even though Ru is metal? 2)Why is TiO ionic? I thought only group 1 and 2 would make ionic compound 3)If the the compound has metal and metalloid like GaAs, is it always semiconductor

41. ## Physics

Light of wavelength 680 nm falls on two slits and produces an interference pattern in which the fourth-order fringe is 47 mm from the central fringe on a screen 1.1 m away. What is the separation of the two slits?

42. ## math

1. Hot dogs come 10 to a package, and hot dog buns come 8 to a package. What is the smallest number of packages of each that Phillip could buy so that there are no leftover hot dogs or buns? Hot dogs 4 Hot dog buns 5 2. Hamburger patties come 6 to a

43. ## Physics!

A piston has a diemaeter of .64 cm. A second piston has a diameter of 3.8 cm. determine the Force necessary on Piston A to support the 500.0 Newton weight on piston B (in the absence of friction.)

44. ## science

Which of the following materials would not be important to a protozoan? a) enzymes b) oxygen c) water d) blood e) carbohydrates Is is enzymes?

45. ## Science

Find the time it takes for a water balloon dropped from a second story window and accelerating at 9.8 m/s² downward to hit a passerby on the sidewalk below. The balloon starts from rest and hits with a velocity of 15.9m/s

46. ## maths

find the number of integers between 32 and 395 that are divisible by 6 find their sum

47. ## chemistry

What is the density of PCl5 gas at STP?

48. ## algebra 2--matrices.

A grocer wants to m,ix three kinds of hard candy to sell for \$2.40 per pound. He need 50 pounds of candy altogether. He mixes sour balls worth \$3.50 per pound,butterballs worth \$2.50 per pound, and starlight mints worth \$1.75 per pound. He mixes twice as

49. ## MATH156

A basketball player has made 135 free throws in 180 attempts. Of the next 50 free throws attempted, how many would she have to make to raise her percent of free throws made by 5%?

50. ## biology

Parasites are dependent on their hosts for survival. Which organism do you think is better adapted to a parasitic lifestyle, one that is virulent and often kills its host, or one that only causes mild chronic illness in its host?

51. ## Spanish

The sentences are: "Es un profesor muy bueno y un buen padre." and "Su padre es médico y es un gran hombre." Why is bueno used in the first instance and buen in the second? And why is gran used instead of grande? The dictionary says that buen and gran are

52. ## Chemistry

A swimming pool 20.0m *12.5 is filled with water to a depth of 3.5m. if the initial temperature of water is 18.4C how much heat must be added to the water to raise its temperature to 29.0C? Assume that the density of water is 1.000g/mL

53. ## Math

The measure of an exterior angle of an equiangular polygon is twice that of an interior angle. What is the name of the polygon?

54. ## CALCULUS

If 6 J of work are needed to stretch a spring from 12 cm to 13 cm and 10 J are needed to stretch it from 13 cm to 14 cm, what is the natural length L of the spring?

55. ## Organic Chemistry

The reaction of (Z)-butenedioic acid (fumaric acid) with butadiene sulfone gives only one product. Draw the product of this reaction and explain why only one product forms

56. ## pre-calculus

While pulling a stalled car, a tow truck's cable makes an angle of 50 degrees above the road. If the tension on the tow truck's cable is 1600 newtons, how much work is done by the truck on the car pulling it 1.5 kilometers down the road? The answer is

57. ## College Chemistry

A 542-g piece of copper tubing is heated to 89.5 degrees Celcius and placed in an insulated vessel containing 159 g of water at 22.8 degrees Celcius. Assuming no loss of water and a heat capacity for the vessel of 10.0 J/K, what is the final temperature of

58. ## Physics

prairie dogs live in underground burrows with at least 2 entrances. they ventilate their burrows by building a mound around one entrace, which is open to a stream of air. a second entrace at ground level is open to almost stagnant air. use bernoullis

59. ## algebra 2

Boiling Lake is a small lake on the island of Dominica. The water temperature of the lake is between 180*F and 197*F. Write a compound inequality for this temperature range. [Graph the inequality.]

60. ## Physics

A crate full of artichokes rests on a ramp that is inclined 10.0° above the horizontal. Give the direction of the normal force and the friction force acting on the crate in each of these situations. (a) The crate is at rest. Normal Force : 1.perpendicular

61. ## Chemistry

∆H⁰rxn, for the reaction of Ca(s) + 2H+(aq) -> Ca2+(aq) + H2(g) is -544 kJ/mol. ∆H⁰rxn, for the reaction of CaO(s) + 2H+(aq) -> Ca2+(aq) + H2O(l) is -193 kJ/mol. Based on these results, what is the ∆Hf for CaO(s) [in kJ/mol] if the heat of

62. ## Spanish

What does "Mi prima Susana y so novio no tienen hasta los ocho porque ella tiene/ viene que trabajar." mean and which word is correct (tiene/viene)?

63. ## Math

A tourist in Ireland wants to visit seven different cities. If the route is randomly selected, what is the probability that the tourist will visit the cities in alphabetical order?

64. ## physics

A force of 15 N is directed at an angle of 55° above the x-axis. A second force of 15 N is directed at an angle of 55° below the x-axis. What is the vector sum of these two forces? How would I go about finding the magnitude or vector sum of those two

65. ## Chemistry

What is the chemistry behind caffeine extraction with Na2SO4, CH2CL2 and NaCO3. I know that Na2SO4 some how aborbs the water from a solution leaving the undissolved soilds or something...

66. ## Chemistry

What mass of cholrine must be added to 100.0 L of water to achieve this level? Most community water supplies have 0.5 ppm of cholrine added for purification.

68. ## PHYSICS

The four tires of an automobile are inflated to an absolute pressure of 200000 Pascals. Each tire has an area of 0.024 m^2 in contact with the ground. Determine the weight of the automobile.

69. ## Math, please check work

A bag contains 7 red marbles, 2 blue marbles, and 1 green marble. If a marble is selected at random, what is the probability of choosing a marble that is not blue? 7+2+1=10 There are two blue marbles So is the probability 1/5?

70. ## Physics

A 4.0-kg block is at rest on a horizontal floor. If you push horizontally on the 4.0-kg block with a force of 12.0 N, it just starts to move. What is the coefficient of static friction?

71. ## chem

Sorbic acid, HC6H702 (pKa=4.77), is widely used in the food industry as a preservative. For example, its potassium salt (potassium sorbate) is added to cheese to inhibit the formation of mold. What is the pH of 0.37M KC6H702(aq)?

72. ## physics

Monochromatic light falls on two very narrow slits 0.035 mm apart. Successive fringes on a screen 4.80 m away are 5.8 cm apart near the center of the pattern. What is the wavelength of the light?

73. ## physics

a slide loving pig slides down a certain 16° slide in twice the time it would take to slide down a frictionless 16° slide. What is the coefficient of kinetic friction between the pig and the slide?

74. ## chemistry

How many milliliters of glycerol, C3H8O3(d=1.26g/mL), must be added per kilogram of water to produce a solution with 4.85 mol % C3H8O3? Kinda lost -.-;

75. ## Physics

A horse is trotting along pulling a sleigh through the snow. To move the sleigh, of mass m, straight ahead at a constant speed, the horse must pull with a force of magnitude T. What is the net force acting on the sleigh? What is the coefficient of kinetic

76. ## geometry

State the negation of the following statement: Lines a and b are parallel.

77. ## Chemistry

I know how to find a and b on this problem but how do I find c? Really would appreciate the help, thanks! The formula of a compound of iron and sulfur was determined using the method of mass measurements. A sample of iron was weighed into a crucible and

78. ## Careers

How has the job of a sous chef changed over time? I'm not too sure about this. Sous chef has always worked for the head chef and has always done what the head chef has told him/her to do.

79. ## math

The polynomial 0.041h-0.018a-2.69 can be used to estimate the lung capacity, in liters,of a female with height h, in centimeters, and age a, in years. Find the lung capacity of a 40 year old woman who is 150 centimeters tall. Her lung capacity is

80. ## Math

How many ways can you arrange 8 different crates on a shelf if they are placed from left to right?

81. ## arithmetic

Each term of a progression is determined by adding 0.5 to the preceding term. the sum of the first 25 terms of the progression equals the square of the 25th term. calculate the possible value(s) of the first term

82. ## chemistry

what if compound has those metalloids(metal near stair case) with gas element, is it going to be semiconductor. Can you think of any other compound with metalloid and gas elements beside SiO2 that is insulator

83. ## precalculus

i need help with homework which is due tommorow determine algebraically whether the graph of the given equation is symmetric to the y axis the x axis or the origin the equations are 5y=7x^2-2x can u show work please thanks in advance

84. ## physics

One end of a cord is fixed and a small 0.610 kg object is attached to the other end, where it swings in a section of a vertical circle of radius 2.00 m as shown in the figure below. When θ = 18.0°, the speed of the object is 4.50 m/s. At this instant,

What is a Jovian Year and Jovian Day?

86. ## Math

Roughly speaking, the standard deviation indicates how far, on average, the observations are from the mean. Do you think that for the data set below the standard deviation will give a good indication of the typical deviation from the mean? 2, 3, 4, 4, 5,

87. ## physics

What factors directly affect how much air drag an object experiences?

88. ## physics

A baseball player with mass m = 80 kg, sliding into second base, is retarded by a frictional force of magnitude 450 N. What is the coefficient of kinetic friction µk between the player and the ground?

89. ## PHYSICS

How would I o about solving this: When a load of 1000000 Newtons is placed on a battleship, the ship sinks only 2.5 cm in the water. Estimate the cross-sectional area of te ship at water level.

90. ## physics

A solenoid is wound with a single layer of insulated copper wire of diameter 2.800 mm and has a diameter 5.000 cm and is 1.500 m long. Assume that the adjacent wires touch and that the insulation thickness negligible. what is the inductance per meter(H/m)

91. ## Chemistry

If 0.670mol of liquid Br2 and 460mL of 1.72M aqueous NaI are reacted stoichiometrically according to the balanced equation, how many moles of liquid Br2 remain? Round answer to 3 sig figs. 2NaI(aq) + Br2(l) -> 2NaBr(aq) + I2(s) Additional Information: MM

92. ## science

Where are the enzymes maltase, sucrase,and lactase produced? Is it the small intestine?

93. ## s.s.

Axum's conversion to Christianity a. beneficial b. a drawback c. first a drawback then beneficial d. first beneficial then a drawback

94. ## Physics

An underwater microphone is used to record sounds emitted by porpoises. The minimum intensity level the instrument can record is 10 dB. Assuming a porpoise emits sound at a rate of 0.05 J/s, what will be the max distance at which the animal will still be

95. ## Chem 1LB

When 0.678 g of Ca metal is added to 200.0 mL of 0.500 M HCl(aq), a temperature increase of 11.0C is observed. Assume the solution's final volume is 200.0 mL, the density is 1.00 g/mL, and the heat capacity is 4.184 J/gC. (Note: Pay attention to

96. ## science - pangaea project

I need help with science pangaea project ideas? my teacher wants a great project, and i really need the grade.? my teacher is expecting an AMAZING project from me, because apparently i'm her best student. anyways, i was thinking that i could show the

97. ## Ice Hockey

what = it is a team sport played on ice who = people from all over the world come to play this sport when = it is played in winter. it was staged at the olympics since 1920 where = it is played in areas that are really cold such as canada, the u.s, etc.

98. ## Math

Suppose there are 7 roads connecting town A to town B and 5 roads connecting town B to town C. In how many ways can a person travel from A to C via B?

99. ## geo

what are china's major imports and exports?

100. ## microeconomics

recently, cellular telephones have become very popular. At the same time new technology has made them less expensive to produce. by assuming the technological advance caused cost curves to shift downward at the same time that demand was shifting to the

101. ## chemistry

Compound A contains 1.75g nitrogen and 3.99g oxygen. Compound B contains 19.6g nitrogen and 56.0g oxygen. Are compounds A and B the same? Explain.

102. ## Chem

Carbonic acid is a diprotic acid that ionizes in two stages. Write the two equations for the successive ionizations of carbonic acid in water.

103. ## maths

In the sequence: x+4y ; 2y+2 ;x ;y-1, (consisting of 4 terms) the first three terms form an arithmetric progression, while the last three tern form a geometric sequence. Calculate the values of x and y. Answer(s) can be left in surd form.

104. ## math

The mass of neptune is about 1.03 x 10^23 metric tons. The mass of the sun is about 1.998 x 10^27 metric tons. About how many times the mass of neptune is the mass of the sun? Give answer in scientific notation.

105. ## chemistry

Determine the molarity of in an aqueous solution at equilibrium with air at normal atmospheric pressure. The volume percent of in air is 20.65 Under an pressure of 1.00 , 28.31 of dissolves in 1.00 at 25.

106. ## Biology

26. The relationship between population growth and resources can be described as a. inverse; as one goes up the other goes down b. parallel; when one goes up so does the other c. complex; there are many contributing factors d. equal; they both level off in

On June 1, Jason Thomas placed an announcement in The Local Journal offering a reward of \$100 to anyone who found and returned his missing wallet. When his wallet had not been returned by June 15, Jason purchased another wallet. Jason then took steps to

108. ## Chem 1LB

When 0.678 g of Ca metal is added to 200.0 mL of 0.500 M HCl(aq), a temperature increase of 11.0C is observed. Assume the solution's final volume is 200.0 mL, the density is 1.00 g/mL, and the heat capacity is 4.184 J/gC. (Note: Pay attention to

109. ## Physics

Consider an infinitely long solid cylinder with radius R_0 and volume charge density rho=rho_0*r(r≤R_0) where rho_0 is a constant. Use first principles to determine the electric field E(vector) for r

110. ## chemistry

Find the molar mass of Chromium (III) Hydrogen Phosphate. Also, what is the chemical formula for this molecule?

111. ## Chemistry

Gold crystallizes in a face centered cubic structure. Using only a periodic table for refrence, determine the edge length of a gold unit cell. Show all Work.

112. ## 3rd grade - Solor System

How many years does it take Jupiter to orbit the sun? One year on the this planet would actually be how many earth years long?

113. ## chemistry

How many grams of water would you add to 1.00 kg of 1.48 m CH3OH(aq) to reduce the molality to 1.00 m CH3OH. Use two sig figs. I get 4.8 * 10^2 grams and its not right. I want to put this up here again to see if there are any errors that could have

114. ## Biology

Alright, last ones on the test: 37. Hyphae a. increase the surface area-to-volume ratio of the fungus b. have slender filaments c. allow for efficient uptake of nutrients d. all of the above D? 38. In which process do tRNA molecules attach amino acids to

115. ## chemistry

How many grams of water would you add to 1.00 kg of 1.48 m CH3OH(aq) to reduce the molality to 1.00 m CH3OH. Use two sig figs. I get 4.8 * 10^2 grams and its not right. I want to put this up here again to see if there are any errors that could have

116. ## chemistry

When 0.767 g of Ca metal is added to 200.0 mL of 0.500 M HCl(aq), a temperature increase of 125C is observed. Assume the solution's final volume is 200.0 mL, the density is 1.00 g/mL, and the heat capacity is 4.184 J/gC. (Note: Pay attention to significant

117. ## economics

A firm has production of cars in 2 countries with the following demand: Sweden: P= 300- 5Q Denmark: P= 150- 3Q Marginal cost for both countries= \$40 per unit Will this company price discriminate, and if yes, which type of price discrimination will it use?

118. ## physics

when any block slides down a smooth incline which is unfixed then the incline moves back.WHY??

119. ## precalculus

is solving this possible graph each function with its parent graph f(x)= -3(x-7)^2+2 i thought it was impossible because they did not say how many units i should move it. if this was the translated graph they did not say what the parent graph was am i

120. ## college chem

a first order reaction has a fifth life of 20 seconds ( the amount of time needed to use up 1/5) a) Prove that the reaction has a constant 1/5 life. b) find the half life.

121. ## English

Hello! Can you tell me if there are any passive clause in this chapter? This is not my homework I am helping my friend with this and I am so confused :/ By extension of meaning, bills of rights are sometimes regarded as including the definition and

122. ## calculus

Could someone help me draw these vectors? These things confuse me. A force of 42 newtons acting on an object at an angle of 53 degrees with the ground A force of 342 lbs. acting on an object while a force of 454 pounds acts on the same object an angle of

123. ## microeconomics

which of the following are actual pareto-efficient changes? explain. a) You buy three oranges for \$1 from a street vendor.b) you sr near death from thirst in the desert and must pay a passing vagabond \$10,000 for a glass of water.c) a mugger steals your

124. ## classroom instruction

Suggest methods for evaluating the lesson’s objective what makes a lesson plan effective

125. ## CHEMISTRY LAB

If the molecular mass for a chemical is 45.99 g/mol and the enthalpy of formation is 34 kJ/mol, the heat change will be

126. ## physics

(1)A parallel-plate capacitor carrying charge q0 is modified by the insertion of a dielectric with κ = 4.3 between the plates. As a consequence, the energy stored in the capacitor quadruples. What will the charge be after the dielectric is inserted? (2)A

127. ## Physics

a) A microphone has an area of 5cm^2. It receives during a 4.0 s time period a sound energy of 2.0*10^-11 J. What is the intensity of the sound? b) using intensity from a) what is the variation in pressure in the sound wave, delta P ? Use T=293 K and

128. ## college physics

The spring constant can be determined from the oscillatory motion. For this case, Newton's second law gives [(m(d^2)x) / (d(t^2))] + kx = 0 where x is the displacement from the equilibrium position. The sample mass is suspended from the spring by a sample

129. ## maths

A brick wall is built by using 2 bricks less in each layer than in the previous one. The wall has m layers and in total 21m+40 bricks are used. If the top layer has only 4 bricks, determine:A) the value of m b) the total number of bricks in the wall

130. ## microeconomics

suppose two passagers both end up with a reservation for the last seat on a train from san franciso to los angeles. two alternatives are proposed: a)toss a coin b)sell the ticket to the highest bidder. compare the two from the standpoint of efficiency and

131. ## math

ok im struggling in math becuase my math teacher isnt really explianing things really good my mom tried 2 swich me to a different teacher but they don't let me wat do i do?

132. ## Math

The measures of the angles of a triangle are in the ratio 1:2:3. Find half the measure of the largest angle?

What do you feel about community corrections? Do you feel a community-based punishment is justifiable in today’s society? Explain why or why not. Provide an example of a community-based punishment. How do community corrections affect American society?

134. ## Math

The coordinates of P are (-2,5) the coordinates of Q are (6,1). What is the equation of the perpendicular bisector of PQ? *I was able to figure out that the slope of line PQ is -1/2 and the equation of PQ is -1/2x+4=y

135. ## U.S History

I need to find a current day person who is similar to Al Capone. I need to write a paragraph on how my 20's persons accomplishments and/or conrtibutions are similar and different to those of my current day person.

136. ## english

bobpursley, but can you give me an example

137. ## Phys

Consider an infinitely long solid cylinder with radius R_0 and volume charge density rho=rho_0*r(r≤R_0) where rho_0 is a constant. Use first principles to determine the electric field E(vector) for r

Consider the experiment of selecting a card from an ordinary deck of 52 playing cards and determine the probability of the stated event. A face card or a 5 is drawn. So there are 12 face cards. Plus 5. So that is 13 options out of 52?

139. ## Biology

Need help with these: 33. In addition to causing disease, protests also affect humans through a. their role in the nitrogen cycle b. their antibiotic properties c. their ability to clean up oil spills d. all of the above A? 35. Fungi obtain food by a.

140. ## maths

three number form an arithmetric sequence. Their sum is 24. A)If 'a' is the first number and 'd' the common difference, show that a+d=8 B)If the first number is decreased by 1 and the second number by 2, the three numbers then form a geometric sequence.

141. ## maths - challenge

Simon starts a new job . On the first day he gets paid 1p . on the second day he gets paid 2p , and every day after that his pay doubles . how many days will it take him to earn £1,000 in a day ?

142. ## physisc! URGEENT

The current is 1.9 m/s. A person can swim 0.7 m/s. What is the best angle for the swimmer so that it is swept downstream the shortest distance possible?

143. ## economics

You are getting ready for your 1st day of work and realize that you have several options of how to get to bank of Wall Street. you could drive your car and look for street parking , or park in the parking garage. you mighteven take a taxi or subway. you

144. ## Accountin

Balance sheet help Preferred stok-\$5.00 par 50,000 balance Common stock-\$2 par 100,000 balance Problem: Stock information *Authorized to sell 75,000 shares of its preferred stock although this class of stock is \$3 dividened value it passed on declaring a

145. ## history

I am doing a "report" on the gas Chambers in Auschwitz during WWII. I am trying to figure out more about how long it took for the prisoners to learn the truth of the gas chambers but I cant find anything help please?

146. ## math

Which expression has the same value as (7a-2)+(a-4) A)8a-6 B)6a+8 C)7a-2 D)8a+8

147. ## Math

The measures of three of the angles of a quadrilateral are 40, 70, and 130. What is the measure of the fourth angle?

Some readers suggest that the "weak" character in Of Mice and Men represent groups of people who were outcasts in 1930s society(for example. Lennie would represent the mentally challenged). For each of the following characters, explain how each could

149. ## algebra

Give the equation of the line that passes through point (5, 1) and is parallel to the line y = 3x – 1. I am so lost. I have no clue how to do this. Can anyone please help?

150. ## Physics

a 123 kg man space finds himself 60 m away from his space ship and wants to get back. he holds a 2kg space gun which fires 5.00g bullet at a rate of 1500m/s. if he fires a single bullet in a direction directly away from the spaceship, how long would it

A student put 12.4 grams of potassium sulfate in 29 ml and stirred for 3 hrs. he saw that not all of the solid dissolved, so he removed the extra solid and found it had a mass of 3.4 grams. what was the solubility of the chemical?

152. ## psy210

psy 210 CheckPoint: Research Methods Research Method Description Application Scientific method Case study method Survey method Naturalistic observation method Correlation method Experimental method

153. ## Chemistry

In a .1M aq. soln of NaCN, how would you determine the major species (other than water)? And how would you determine the pH (not exact pH, I just want to know how to know if it is acidic ie.

154. ## math

Cancel common polynomial and integer factors: (x^2+10x+24)/(x^2+12x+32) ????

155. ## English

Thank you very much! I would like you to check these few more statements, too. 1) Summarise briefly (or briefly summarise) the history of England from the prehistory (or from its prehistoric inhabitants) to the Anglo-Saxon invasion (or to the Anglo-Saxon

156. ## math

i'm a poet... i don't know math!!! Write 3 X 10^7 km^3 , the total volume of the continental Antarctica ice sheet, in standard form. would it be 30000000000 ?

157. ## accountin

Not sure where to place this on the balance sheet The cash account has a current balance of 22,500 Problem:The cash balance includes \$1,200, the first deposit in a fund for the eventual purchase of an adjacent piece of property

158. ## science

We are more dependent upon electricity than people in the past. What does this mean?

159. ## CHEMISTRY

What is reaction between HI+HNO3

160. ## English

Oh ok because Whitacher said that Guru told me something but he did not. Who is Jiskha?

161. ## algebra

6x-7y=21 7y-6x=-21

162. ## critical thinking

The reason the auto industry is such a mess is the outrageous union contracts that the automakers are burdened with. Fallacy Type: Why it is this fallacy type: Resource that describes this fallacy type:

163. ## help

hi im trying to order something online im shipping it to brooklyn ny but i don't know if im apo or fpo please someone help

164. ## English

I forgot to include the following statements. Thank you very much!! 8.He is linked/attached to the past 9.He gives this description of his father to underline that (or the fact that?) he is the only one able (or who is able) to govern 10. In front of the

165. ## math

Without finding the exact answer, select which of the following numbers is the best estimate of each sum or difference and justify your choices: -2/3, 0, 2/2/3. a. 1/9 + 2/5 – 1/3 – 3/4 I am confused on where to begin on this question.

166. ## Algebra 2

write the sum using summation notation 1+6+13+22+33

167. ## Chemistry

5.00mL of .00500 M ferric nitrate is added to 5.00 Ml of nitric acid and 10.0 Ml of .00250 M thiocyanate solution. Calculate the initial FE^3+ concentration before reaction. I know F3^3+=Cfe-[FESCN^2+] after that I have no idea what to do. Help please??

168. ## To Ms. Sue

Ms. Sue which 2nd and 3rd sentences?

169. ## chemistry

The initial concentration for the compounds involved in the reaction displayed were determined to be [BrI(g)] = 0.3220 mol/L, [Br2(g)] = 0.3287 mol/L, [I2(g)] = 0.004086 mol/L. Calculate the value of the equilibrium constant (Kc) at 423.0 K if the

170. ## math.math.math

how would you simplify (ab)to the 5th power ?

171. ## Calculus

Find the derivative of y=xsin(2/x)? On web-assign everything that I have tried has been wrong.

172. ## Math

How do I find the probability of the event described. What is the probability of rolling a number less than or equal to 4?

173. ## math

operations on functions: Given f(x) = 2root x+7 and g(x) = 5x^2 – 9, evaluate (f/g)(2) . I don't understand how to do this, can someone please explain the process??!! thanks!

174. ## algebra

A store sells a 1-liter container of juice for 75¢ and a 2-liter container for \$1.40. Assume that the cost varies linearly with the number of liters, and find the slope of the line that shows the relationship. How many liters would be in a container that

175. ## Conflict Management

Name at least 3 Passive aggressive groups and behaviors in society I was thinking the KKK, Civil Rights Movement, and disgruntled workers in the workplace. Any other thoughts would be greatly appreciated! Thanks :)

176. ## science - pangaea

my idea for my project is to cut out continents and be able to move them together to form pangaea. and also be able to move them apart again. how can i do this?

177. ## English

I have to write a paragraph writing a description about my sister using figurative language. Please find the paragraph below. Can you please give me some feedback. Thanks My sister is very important to me. She is my best friend. I know everything about her

178. ## math

81y4 - 16 i know its A2 – b2 = (a-b)(a+b) but i cant figure it out

179. ## economics

As such, you are assigned the duty of ensuring the availability of 100,000 yen for a payment scheduled for next month. Considering that your company possesses only US dollars, identify the spot and forward exchange rates. What are the factors that

180. ## algebra

In 1995, the life expectancy of males in acertain country was 67.5 years. In 2002, it was 70.8 years. Let E represent the life expectancy in year t and let t represent the number of years since 1995. The linear function E(t) that fits the data is

181. ## To. Ms. Sue

Ms Sue, I have to tell why I think that the 5 athletes who held the olympic flame in the opening ceremony were suitable choices for this honour, I don't know why. I only think that they are very famous and outstanding, and have a lot of fans. I think that

182. ## english

n A Tale of Two Cities chapter 15 in book the second, what had M Defarge done n attempt to save the tall man?

183. ## Crt/205 Critical Thinking

I need help with this assignment: Argument Evaluation DUE: Day 7 Points: 100 · Read the essay “Bush’s Environmental Record” by Bob Herbert found in the “Appendix 1”, pgs. 461-462. To find this, click on the “Controlling Irrational Fears after

184. ## chemistry

How many neon atoms are there in five moles?

185. ## science

i need to draw a picture of nitrogen as a person, with the amount of protons, neutrons, electrons and the atomic number, all of which are 7, corresponding to the head, body, arms and legs. any ideas on how to draw this?

186. ## To. Ms. Sue

Ms. Sue please take a look at my previous post, I still need help :-(

187. ## math

Express the ratio in simplest form. 48 feet to 20 feet

188. ## physics

newyorks 33-m tower oscilatesnin the wind with a period of 6.80s calculate the frequency

189. ## dental health

why do we celebrate dental health month?

190. ## Math help

here's the question Dear Dr. Math, I wanted tto find the area of this hexagon. I few the apothem as I've shown. Then I measured the apothem and perimeter. I used the formula a=1/2ap and got 3.2cm^2 for the area but that seems way too small for me. I think

191. ## Statistics

How do you know the p-value on megastat. On minitab It looks like it gets a different p-value than megastat. I got a number from megastat of 2.35E10 and on minitab it was 0.000.

192. ## math

Simplify (5a^3)^4 can some one show me how to do this problem.

193. ## Physics

Find the net force on a,b and c. Given ma=363kg mb=517kg and mc=154kg. abc This was a question given to our class by our physics teacher ... he did not show us how to do it. So any help/steps involved to solve this problem would be much appreciated.

194. ## english

how to make this thesis on correct placement(Today the price of gasoline is at record high, which brings the question of whether or not the U.S. should start drilling more onshore or offshore. In order to bring now jobs on the market, and lessen the burden

195. ## math

60% of the MacRaes five children are boys. How many boys are there. I need help on this, I am stuck. Thanks Jill

196. ## Ice Hockey

i know some things about ice hockey i know that it is canada's national game and is a significant addition to world sport. It is played seriously by men and women in 20 countries. it is a fast paced antipathetic sport in which 2 teams of six players

197. ## english

Is many unhappy girls a fragment or run-on sentence

198. ## Physics

The sound intensity of 1.0 x 10^-12 J/(m^2*s) is the threshold of hearing for humans. What is the amplitude of the motion of the air molecules? Use v=340m/s and 1.2 kg/m^3 as the density of air. I believe the formula I would use for this is

199. ## Physics

how would i find the total time spent decelerating on a velocity time graph

200. ## math

what is the circumference of a circle if 2 isa the radius

201. ## English

Can you please tell me if the following statements are correct. In particular, if the ones in parentheses are also possible? Thank you. 1)The old king Hamlet is linked with (associated with) beauty and justice, whereas Claudius is linked with a filthy

202. ## nutrition

what effects might alcohol and caffeine have on hydration levels in the body?

203. ## Ice Hockey

did paragraph

204. ## Physics

how to find the average velocity and speed for an entire postion time graph

205. ## masters level finance

I am stuck at the last line of this problem. The original formula is R=Rf+B(Rm-Rf) I have moved it and placed the known information in 14=Rf+1.45(11.5-Rf) Then moved it further 14=Rf+16.68-1.45Rf I need to solve for Rf, but I am having a hard time

206. ## math

The Ramsey's assets are to be divided among their three children Agnessa, Rebecka, and Cody in the ratio of 8 : 6 : 3. For full marks your answer(s) should be rounded to the nearest cent. a) If Rebecka received \$6,500 from the sale of securities, what

207. ## Science

I just want to see what you all think. I had to write a paper on Malathion and the West Nile Virus. I also had to go by the following topics. Please let me know what you think of the paper. Thanks! Hazard Identification: A lot of people including but not

208. ## A & P

how is blood clotting, immune response, allergic reaction and hormone release interrelated?

209. ## algebra

Solve 5r-8=2 8r+5s=21

210. ## algebra

Solve the linear equation using any technique you have learned. Name the technique. Check. 3x + 12 = -7x - 28 I know the answer is x = -4 and I know that substitution is the technique that is used, but I can't figure out how to set this up

211. ## critical thinking

I don’t care if he has a PhD from Harvard! He’s a Mormon for heaven’s sake! How can anyone with such extremist views be considered credible? Fallacy Type: Why it is this fallacy type: Resource that describes this fallacy type:

212. ## Calculus

find the definite integral that represents the are of the region enclosed by y= 4x-x^2.

213. ## Physics

This is a long one, but it is a no solve. Youʼre cooking four pancakes, one at a time, using a stove-top timer to judge the time Ät needed to cook each side (i.e. half) of each circular cake (radius = r). The timer emits a “ding,” a sound whose

214. ## English

Can you please tell me if the following statements are correct. In particular, if the ones in parentheses are also possible? Thank you. 1. Hamlet’s father is described/defined/delieneated/portrayed/represented/outlined as a murderer, a villain, a slave,

215. ## English

Thank you very much for your last suggestions! Can you check these last statements of the day, please? Thank you 1) The mirror is a recurrent theme in the poetry of the American poetess Sylvia Plath. Describe its characteristics, qualities and symbolic

216. ## algebra

which formula is best to find how many ounces of broth could be held in a cylinder that has a radius of 2inches and height of 7 inches if every cubic inch of volume contains one-fourth ounce of broth?(round the answer)

217. ## Physics

A hypothesis says the upper limit in frequency a human ear can hear can be determined by the diameter of the eardrum, which should have approximately the same diameter as the wavelength at the upper limit. Using the hypothesis what would be the radius of

hi im trying to order something online im shipping it to brooklyn ny but i don't know if im apo or fpo please someone help .someone posted this but i still don't know if im apo or fpo can you tell me if im fpo or apo i live in brooklyn ny Since this is not

219. ## Geography

How can we control inward migration of humans within the UK?

220. ## Speaking

How can you create an effective climate when discussing matters of importance with co-workers, clients, vendors, superiors and employees

221. ## Math

can someone sow me step by step how to evaluate the integral of the square root of x^3 using a u substitution? I don't understand this topic and I have a lot of problems to do like this so can someone just sow me so I can see the process? Thanks.

Do you believe that the move from selling music on a physical product to selling it digitally represents a change that will affect other industries

223. ## math :(

how would you find the length of a semicircle using pie 22/7 when the radius shown is 14 ?

224. ## Math

Adam, Bill, Chris, and Dave each own one quarter of a company. Bill sells 2/3 of his shares to Dave. Adam sells 3/5 of his shares to Chris and the rest to Dave. How much of the company does Dave own now?

225. ## English

I forgot to include the following two statements. Thank you very much for your help. 1)He believes a good slogan needs to be short,to have rhythm and above all to sound natural. That’s why slogans tend to go out of date very quickly. 2) He doesn’t want

226. ## english

I have to write a paragraph writing a description about my sister using figurative language. I have no idea what to do. Can you give me an example paragraph on how to start. This will help you. My sister is Sporty and is a fast runner. My sister is

227. ## Chemistry

Order the following solids according to increasing lattice energy. HgI2, CdCl2, ZnCl2 Now I get how to sort of do it, but I do not get how to do it if I'm looking at its radius if they do not provide it in the question.

228. ## algebra

Evaluate and tabulate the values of y for the value(s) given. y = 2x3, for x = -3, 0, 1, 4 Can someone explain how to set this up? I do not know what the question is wanting me to do.

229. ## Physics

How would i find the average velocity for certain points finding the average velocity between 0.2 hours and 0.4 hours object is at 20m at the 0.2 hours object is at 10km at rest at the 0.4hours

230. ## math

what is the area ofa circle if the diamter is 20

231. ## English

I forgot to include the following statements. Thank you very much!! 1)He fears that when Caesar will become (becomes) king he will turn into a dictator depriving the Romans of their liberty. 2)The ghost asks Hamlet to take revenge for his death (murder)

232. ## English

Can you help me rephrase this sentence? Prospero was set adrift with her daughter Miranda on a boat (set adrift???) on order of his brother Antonio. Thank you

233. ## Physics

A hollow glass block floats in a container of ethanol. Initially, everything is at a temperature of 20 degrees C, and 6% of the block is above the surface of the ethanol. If you everything gradually and evenly, at what temperature will the block sink to

234. ## critical thinking

The President’s agenda has been derailed by out of touch right-wing extremist lies spread by cable media and talk radio. Fallacy Type: Ad hominem Why it is this fallacy type: Resource that describes this fallacy type:

235. ## Psychology

How has early memory research concerning the growth of cognitive perspectives in psychology changed over the course of the 20th century? What are the reasons for this change?

236. ## Finance

I need help doing a pro forma balance sheet.

237. ## chemistry

how do you synthesize benzoic acid from p-bromotoluene? what reagents would you add to remove the bromine group?

238. ## Pre-Calc

medication duration using the function of e through time lapse problem D(h)=8e(up carrot)-0.31(h) find med level at 1 hour- no problem 5.88mg. but every time I insert 4 for the 4 hours I get a larger number... much larger indicting the med level has gone

Peter, a farmer, leaves 3 bushels of tomatoes with Keagan, the owner of a grocery store. Peter says “Look these over. If you want them, they’re \$3.00 a bushel.” Keagan never gets back with Peter. Keagan runs out of his own tomatoes and begins selling

240. ## Chemistry

What kind of compound would you add to the water-insoluble amine aniline to make it more soluble in water?

241. ## chemistry

The mass of twenty-three dozen pencils is 1.496 kg. What is the mass of 1 pencil?

242. ## careers

What part of food science does the career of sous chef fall under? Options: preparation, utilization, evaluation,production I was thinking preparation because you're a chef but sous chef also make menus so what would that go under?

243. ## Physics

How would i find the total time spent decelerating on a velocity time graph? would it be the parts on the graph with negative velocity like -20m/s

244. ## 3rd grade - Solor System

Two Questions: If it takes Jupiter 9.9 hours to make one rotation around the earth. This means that one day on Jupiter is actually how long? This is as many as how many Earth days?

245. ## calculus

find the derevative (hint try to use limits) (x^2010 - 1 )\(x -1 )as x approaches1

246. ## math

what is the are of a cicle if the radius is 5cm

247. ## math

what is the difference between circumference and area

248. ## Physics

How would i find the average velocity for certain points.? finding the average velocity between 0.2 hours and 0.3 hours object is at 20m at the 0.2 hours object is goes down(backwards) to 10m at the 0.3hours

249. ## Math

Is this right I have to set it to y=? 3x-y=9: y=-9+3x How would you set these two problems to y=? 3y=x+6 4x+3y=12

Who is guru?

251. ## math

4x+5y=5 8x+10y=10

252. ## com220

I am having a hard time with my assignment it is asking consider the following effective visuals can illustrate points in your research paper and help readers understand and accept your argument more easily. Develop two or more visual you plan to use in

253. ## math

The following graph shows the growth of the median home value in a particular region of the United States starting in 1996. The graphs starts in 1996 and shows the trend through the year 2000; therefore x = 0 represents the year 1996 and x = 4 is 2000.

254. ## math

how do you solve this linear equation? x/3-1/3=-5 I do not understand this with fractions. Can anyone help?

255. ## Math

Can you please check to see if these are right? We have to set each of them to y. Thank You. x-y=-3: y=-3x 2x+y=5: y=5-2x 2x+y=8: y=8-2x

256. ## maths

i think of a number and divide it by 25 and then add 6 . the answer is 18 . whatnumber did i think of ?

257. ## math

25v^2-4=0 v=___ (Has to be an interger or a simplified fraction. Use a comma to separate answers as needed)

258. ## math

how do u find the coordinates to graph 2x=10?

259. ## Science

Is it ever possible to be completely healthy?

105/5*20+5

261. ## math

Would you rather receive simple interest at the rate of 10% per year or 1% per month? Explain.

262. ## Math Check

Is this correct we have to set this problem equal to y? 2x-y=4: y=-4+2x

263. ## critical thinking

From a politician asked by reporter about an alleged ethics violation: “I am not here to discus accusations based on the politics of personal destruction. What the American people want to hear about is how we are going to create job’s. Fallacy Type:

264. ## Math

.704=log(100/x) I tried this 10^.704=10^(100/x) But i not sure what to do now?

265. ## algebra

2[(-1)^n+1] how to simplify?

Given f(x) = 2root x+7 and g(x) = 5x^2 – 9, evaluate (f/g)(2) . I don't understand how to do this, can someone please explain the process??!! thanks!

267. ## SCIENCE - CLIMATE - ALBEDO

what is the connection between the amount of albedo and energy absorbed?

268. ## Government

Weigh the advantages and disadvantages of the current democratic system. In the chapter on the presidency, for example, you must determine the most and least important presidential power. I have some ideas like the pros are the checks and balances system

269. ## Math Repost (Logs)

.704=log(100/x) I tried this 10^.704=10^(100/x) But i not sure what to do now?

270. ## math

how would u factor ab (to the 2nd power) - b

271. ## geography

immigration and emigration patterns of china

What does Jupiter look like?

273. ## world history

how did japan and china feel about the europeans

274. ## calculus

find the derevative (hint try to use limits) (x^2010 - 1 )\(x -1 )

275. ## math

what is the circumference of a circle if 2 isa the radius

what is area

277. ## math

what is the circumference of a circle if 13 is the diameter

278. ## math --help

factor completely 5a^2-14a+8

279. ## science

do a quad genitic cross :-(