# Questions Asked onOctober 15, 2012

1. ## algebra

Which set represents a Pythagorean triple? 27, 38, 42 33, 44, 55 35, 38, 42 68, 72, 81 Which number completes the Pythagorean triple: 12, 16, ____? 18 20 22 24 A base ball diamond is square. The distance from home plate to first base is 90 feet. In feet,

2. ## physics

The 20-g centrifuge at NASA's Ames Research Center in Mountain View, California, is a horizontal, cylindrical tube 58 ft long and is represented in the figure below. Assume an astronaut in training sits in a seat at one end, facing the axis of rotation

3. ## Chemistry

Balance the equation and write the reaction-quotient expression, Qc. U(s) + F2 (g) UF6 (g)

4. ## Chemistry

The complete combustion of 1.283g of cinnamaldeyde (C9H8O, one of the compounds in cinnamon) in a bomb calorimeter (Ccalorimeter=3.841 kJ/C) produced an increase in temperature of 130.32 C. Calculate the molar enthalpy of combustion of cinnamaldehydy

5. ## physics

How much heat is necessary to change 500g of ice at-10 celsius to water at 20 celsius?

6. ## chemistry

Given the balanced equation for the decomposition of INO, and the rate of disappearance of INO, write the expressions for the rates of appearance of I2 and NO 2INO(g) ---> I2(g) + 2NO(g) Reactant: Product(I2): Product(NO): -∆[INO]/2∆t = ??/?? = ??/??

7. ## Chemistry Lab

Hydrogen gas was collected over water in a eudiometer at 26 degrees celcius when the atmospheric pressure was 756 mm Hg. What was the pressure of the H2 gas?

8. ## Chemistry

Phthalates used as plasticizers in rubber and plastic products are believed to act as hormone mimics in human. The value of deltaHcombustion for dimethylphthalate (C10H10O4) is 4685 kJ/mol. Assume 1.035 g of dimethylphthalate is combusted in a calorimeter

9. ## chemistry

Nitric oxide (NO) can be removed from gas-fired power-plant emissions by reaction with methane as follows: CH4(g) + 4NO(g) --> 2N2(g) + CO2(g) + 2H2O(g) Complete the equation relating the rates for each of the following: a) the rate of appearance of N2 to

10. ## PreCalculus

A piano tuner strikes a tuning fork for note A above middle C and sets in motion vibrations that can be modeled by the equation y = 0.001 sin 880 Pi(T). Find the amplitude and period for the function.

11. ## chemistry

for depolarization of 1 mole of KMnO4, the moles of H2O2 required is_________

12. ## Physics

A tennis ball is dropped from 1.80 m above the ground. It rebounds to a height of 1.00 m (assume down to be negative). (a) With what velocity does it hit the ground? (b) With what velocity does it leave the ground? (c) If the tennis ball were in contact

13. ## Calculus

f(theta)= 4sec(theta)+ 2tan(theta), 0 less than theta less than 2pi. find all critical numbers

14. ## Chemistry

Given N2(g) + 3H2 = 2NH3(g), which scenario will allow you to eventually reach an equillibrium mixture involving these chemicals? A. Place only H2 into a sealed vessel. B.Place only NH3 into a sealed vessel. C.Place only N2 into a sealed vessel. D.All of

15. ## physics

3. A satellite of mass 500 kg orbits the Earth with a period of 6000 s. The Earth has a mass of 5.98 x 1024 kg. (a) Calculate the magnitude of the Earth's gravitational force on the satellite. (b) Determine the altitude of the satellite above the Earth's

16. ## Physics

A surfer is catching a wave. Suppose she starts at the top of the wave with a speed of 1.3 m/s and moves down the wave until her speed increases to 8.0 m/s. The drop in her vertical height is 2.8 m. If her mass is 59 kg, how much work is done by the

17. ## Physics

As a moon follows its orbit around a planet, the maximum gravitational force exerted on the moon by the planet exceeds the minimum gravitational force by 28.2 %. Find the ratio rmax/rmin, where rmax is the moon's maximum distance from the center of the

18. ## Physics

7. A stock person at the local grocery store has the job of 1) picking up boxes of tomatoes from the stockroom floor, 2) accelerating to a comfortable speed, 3) Carrying the boxes to the tomato display at constant speed, 4) decelerating to a stop, and 5)

19. ## Chemistry

why is it important to add 1M HCl dropwise to the crucible?

20. ## geometry

Yuki just bought a big screen TV set. The screen has a diagonal measure of 40 in. If the screen is 32 in. wide, how high is it?

21. ## PHYSICS

A skateboarder starts at point A in the figure(Figure 1) and rises to a height of 2.64 m above the top of the ramp at point B. What was the skateboarder's initial speed at point A?

22. ## trig

A plane is flying 12,000 feet horizontally from a tall, vertical cliff. The angle of elevation from the plane to the top of the cliff is 45degrees, while the angle of depression from the plane to a point on the cliff at elevation 8000 feet is 14degrees.

23. ## Math

The number N of bacteria in a refrigerated food is given by N(T) = 10T2 − 20T + 700, 1 ¡Ü T ¡Ü 20where T is the temperature of the food in degrees Celsius. When the food is removed from refrigeration, the temperature of the food is given by T(t) = 5t

24. ## chemistry

The reaction Cl(g)+ O3(g) --> ClO(g)+ O2(g) is the first-order in both reactants. Determine the pseudo-first-order and second-order rate constants for the reaction from the data in the table below if the initial ozone concentration was ..0000000000825 M or

25. ## College Algebra

The campus of a college has plans to construct a rectangular parking lot on land bordered on one side by a highway. There are 720 feet of fencing available to fence the other three sides. Let x represent the length of each of the two parallel sides of

26. ## physics

A cyclist is coasting at a steady speed of 17m/s but enters a muddy stretch where the effective coefficient of friction is 0.60. What will be the speed upon emerging?

27. ## college chemistry

Please be specific! Briefly explain whether each if the following procedural errors would result in a high, low, or an unchanged calculated mass of Ca2+ in the analyzed tablet. a)a student had difficulty decanting the supernatant solution from the test

28. ## chemistry

2C6H6(l) + 15O2(g) --> 12CO2(g)+ 6H2O(g) how to calculate the ratio?

29. ## Math

Show how to make one addend a ten. Complete the new addition sentence. 22+49= ? ---- + ---- =

30. ## chemistry

The reaction Cl(g)+ O3(g) --> ClO(g)+ O2(g) is the first-order in both reactants. Determine the pseudo-first-order and second-order rate constants for the reaction from the data in the table below if the initial ozone concentration was ..0000000000825 M or

31. ## Literature

2. In The Call of the Wild, the bond between Buck and Thornton is best explained by observing that A. dog and man were like mirror opposites. [B. dog and man were both in touch with their primordial nature.] C. Buck had helped Thornton pay off his debts.

32. ## university physics

Two forces act on a 4.00-kg object in a manner that the object has an acceleration 3.00 m/s2 in a direction 20.0° north of east. The first force is 15.00 N in a direction 10.0° west of north. What is the second force?

33. ## elementary

Draw an array. Then write a fact family to describe your array

34. ## Calculus

A pebble is dropped into a pond, causing ripples in the form of concentric circles. The radius r of the outer ripple is increasing at a constant rate of 2 feet per second. When the radius is 10 feet, at what rate is the total area A of the disturbed water

35. ## math

The scatter plot shows the study times and test scores for a number of students. How long did the person who scored 81 study? A. 50 minutes B. 81 minutes C. 16 minutes D. 100 minutes helppppppp!!!!!

36. ## chemistry

an ionic equation has 2H+(AQ)on the left side and H2(g) on the right. Are these species spectators? explain.

37. ## physics

the frequency of middle C on a piano is 261.6hz. What is the wavelength of sound as it travels @room air and in water?

38. ## graphs Math

how could I redraw the graph so that the change in customers between the two months does not seem so great? Do I start from zero? Intervals by 5? Any other advice before I start?

39. ## Algebra

he spreadsheet shows the length of 3 movies in each of 3 categories. Choose the formula that could be used in cell B2. A B C D E 1 Type of Movie Movie 1 (min. long) Movie 2 (min. long) Movie 3 (min. long) Mean Length 2 Animated 72 63 84 73 3 Drama 92 104

40. ## Physics

A pitcher throws a 0.140-kg baseball, and it approaches the bat at a speed of 50.0 m/s. The bat does Wnc = 65.0 J of work on the ball in hitting it. Ignoring air resistance, determine the speed of the ball after the ball leaves the bat and is 25.0 m above

41. ## Physics

A 1600-kg car experiences a combined force of air resistance and friction that has the same magnitude whether the car goes up or down a hill at 32 m/s. Going up a hill, the car's engine produces 54 hp more power to sustain the constant velocity than it

42. ## Math

Show his to make one addend a ten. Complete the new addition sentence. 15+37=? ---- + ---- =

43. ## TRIG.

From a point 50 feet in front of a church, the angles of elevation to the base of the steeple and the top of the steeple are 35° and 47° 20', respectively. Find the height of the steeple. I missed class this day and have no idea how to go about this

44. ## Physics

A skier is gliding along at 5.0{\rm m/s} on horizontal, frictionless snow. He suddenly starts down a 15{\rm ^{\circ}} incline. His speed at the bottom is 15{\rm m/s} .

45. ## chemistry

Please be specific! Briefly explain whether each if the following procedural errors would result in a high, low, or an unchanged calculated mass of Ca2+ in the analyzed tablet. a)a student had difficulty decanting the supernatant solution from the test

46. ## Physics

Florence who weighs 120lb stands on a bathroom scale in an elevator. What will she see the scale read when the elevator is accelerating upward at 4.0 m/s^2 a) 120lb b) 135lb 3) 105lb d) 90lb

47. ## Newton's law

7. A uniform flexible chain of length l, with weight per unit length lamba, passes over a small, frictionless, massless pulley. It is released from a rest position with a length of chain x hanging from one side and a length l-x from the other side. Find

48. ## Algebra

A school planned to buy x calculators for a total cost of Ksh 16200. The supplier agreed to offer a discount of Ksh 60 per calculator. The school was the able to get three extra calculators for the same amount of money. (a) Write an expression in terms of

49. ## physics

A man claims he can safely hold on to a 11.90 kg child in a head-on collision with a relative speed of 117. mi/h lasting for 0.140 s as long as he has his seat belt on. (a) Find the magnitude of the average force needed to hold onto the child.

50. ## chemistry

What is the bonding continuum?

51. ## Chemistry

I am having such a hard time approaching this problem. It would be great if you can help me. 1.0 mole of CH4 react with 1.0 mole of O2 in a sealed container. (a) When the reaction is complete, what is the container? (b) How many moles of water are

52. ## Math( < > )

Find clues to the mystery number , the number is less than 800 but greater than 780 , it has 8 more 10's than 1's _________.

53. ## physics

A skier slides down a slope to the left at a constant speed.

54. ## Physics

An elevator weighing 10 000N is supported by a steel cable. Determine the tension in the cable when the elevator is accelerated upward at 3.0 m/s2 A) 7.0kN B) 10.0 kN C)11.6 kN D) 13.1 KN E) 40.0 kN

55. ## Physics

A farmhand pushes a 23kg bale of hay 4.0m across the floor of a barn. If she exerts a horizontal force of 91N on the hay, how much work has she done?

56. ## science

i need an acrostic poem of the word eukaryotic

57. ## Chemistry

Using data from the following reactions and applying Hess's law, calculate the heat change for the slow reaction of zinc with water (answer must be in kJ/mol Zn): Zn(s) + 2 H2O(l) ----> Zn^2+(aq) + 2 OH-(aq) + H2(g) (ΔHrxn = ?) H+(aq) + OH-(aq) ---->

58. ## Chem II

A sample of gas at 38 degrees Celsius occupies a volume of 2.97 L and exerts a pressure of 3.14 atm. The gas is heated to 118 degrees Celsius and the volume decreased to 1.04 L. Determine the new pressure exerted by the gas.

A charge is to be placed at the empty corner to make the net force at corner A point along the vertical direction. What charge (magnitude and algebraic sign) must be placed at the empty corner if the three charges have the same charge of +7.63 μC?

60. ## Chemistry

I am having such a hard time approaching this problem. It would be great if you can help me. 1.0 mole of CH4 react with 1.0 mole of O2 in a sealed container. (a) When the reaction is complete, what is the container? (b) How many moles of water are

In a Broadway performance an 80.0 kg actor swings from a 2.05 m long cable that is horizontal when he starts. At the bottom of his arc he picks up his 47.0 kg costar in an inelastic collision. (a) What is the velocity of the swinging actor just before

62. ## Chemistry

write the conjugate acid of this base. PO4^3-

63. ## geometry

Each side of a equilateral triangle measures 12 cm. Find the height, h of the triangle.

64. ## Chemistry

The alcohol in gasohol burns according to the reaction C2H5OH(l) + 3O2(g) --> 2CO2(g) + 3H2O how many grams of water are produced when 3.0 moles of C2H5OH are burned in an excess of oxygen gas?

65. ## Physics

Consider two vectors F~ 1 with magnitude 44 N inclined at 163 ◦ and F~ 2 with magnitude 72 N inclined at 236 ◦ , measured from the positive x axis with counterclockwise positive. What is the magnitude of the resultant vector F~ 1 + F~ 2 ? Draw the

66. ## Math

A school planned to buy x calculators for a total cost of Ksh 16200. The supplier agreed to offer a discount of Ksh 60 per calculator. The school was the able to get three extra calculators for the same amount of money. (a) Write an expression in terms of

67. ## Literature

5. As we find with most songs, in poetry [A. there's no specific point of view.] B. each couplet must rhyme. C. sound and content have equal weight. D. meanings are hidden in imprecise words.

68. ## chem

The complete combustion of 1.283g of cinnamaldeyde (C9H8O, one of the compounds in cinnamon) in a bomb calorimeter (Ccalorimeter=3.841 kJ/C) produced an increase in temperature of 130.32 C. Calculate the molar enthalpy of combustion of cinnamaldehydy

69. ## U.S history

okay i want to check and see if my answers are corrects before i submit my stuff. can someone help ? i think i know the answers but the questions are: 1. The cotton gin changed agriculture in the South by (1 point) A. simplifying the planting process. B.

70. ## Physics

A 1800-kg car experiences a combined force of air resistance and friction that has the same magnitude whether the car goes up or down a hill at 28 m/s. Going up a hill, the car's engine produces 52 hp more power to sustain the constant velocity than it

71. ## Physics URGENT!!!

A 4.02 kg steel ball strikes a massive wall at 11.8 m/s at an angle of 60.0° with the plane of the wall. It bounces off the wall with the same speed and angle, as shown in the figure below. If the ball is in contact with the wall for 0.174 s, what is the

72. ## Physics URGENT!!!

Gayle runs at a speed of 9.00 m/s and dives on a sled, initially at rest on the top of a frictionless, snow-covered hill, that has a vertical drop of 20.0 m. After she has descended a vertical distance of 4.00 m, her brother, who is initially at rest, hops

73. ## Government

Write a 1,000-word report on two different ways that you, as a young citizen, can become active in politics that would help promote causes that you believe in. You may choose a specific organization that is politically active. In the report, tell the goals

74. ## Math

A telephone is anchored to the ground by a long cable called a guy wire, at a point 5 meters from the base of the pole, the wire makes an angle of 72.5 degrees with the horizontal. What is the length of the guy wire? HELP ASAP! I forgot how to compute for

75. ## Math

Trish says that if 5/7 of her pencils are yellow, then 2/7 are not yellow. Is she correct. Explain

76. ## PHYSICS

At an amusement park, a swimmer uses a water slide to enter the main pool. The swimmer slides without friction, and descends through a vertical height of 2.98m. Find the swimmer's speed at the bottom of the slide if she starts with an initial speed of

77. ## Physics HELP!!

A student presses a book between his hands, as the drawing indicates. The forces that he exerts on the front and back cover are perpendicular to the book and are horizontal. The book weighs 29.7kg. The coefficient of static friction between his hands and

78. ## Chemistry

Liquid sodium is being considered as an engine coolant. How many grams of liquid sodium (minimum) are needed to absorb 3.60 MJ of energy (in the form of heat) if the temperature of the sodium is not to increased by more than 10.0 °C? Use CP = 30.8

79. ## Physics

A 74.1 kg climber is using a rope to cross between two peaks of a mountain as shown in the figure below. He pauses to rest near the right peak. Assume that the right side rope and the left side rope make angles of 48.0° and 11.16° with respect to the

80. ## Math

A baseball diamond is a square with sides 22.4m. The pitchers mound is 16.8m from home plate on the line joining home plate and second base. How far is the pitchers mound from first base? Step by step please.

81. ## physics

Standing on a balcony, you throuw your keys to a friend on the ground below. 1.2 seconds after releasing the keys, they have an instantaneous velocity of 14.8 m/s directed 53 degrees below horizontal. What initial velocity did you give them?

82. ## math

A water trough is 4 m long and its cross-section is an isosceles trapezoid which is 210 cm wide at the bottom and 280 cm wide at the top, and the height is 70 cm. The trough is not full. Give an expression for V, the volume of water in the trough in cm^3,

83. ## Math

Show how to make one addend a ten. Complete the new addition sentence. 38 + 25=? ---- + ---- =

84. ## physics

a student stands on an elevator scale at rest on the 64th floor of a building. the scale reads 847 N. As the elevator moves up the scales increases to 923 N, then decreases back to 847 N. the acceleration of gravity is 9.8m/s^2. Answer in units of m/s^2

85. ## english

Roman was an orphan who had barely survived in a war camp.

86. ## s.s.

"unemployment leads to wastage of man power resource" justifythe statement with suitable examples.

87. ## Physics

A little red wagon with mass 7.0kg moves in a straight line on a frictionless horizontal surface. It has an initial speed of4.00 m/s and then is pushed 3.0m in the direction of the initial velocity by a force with a magnitude of 10.0 N a.) Use the

88. ## Chemistry

How many milliliters of 7.00M HCl solution are needed to obtain 0.200mol of HCl?

89. ## Chemistry

How many moles of KBr are present in 120mL of a 0.290M solution?

90. ## College Chemistry

We will calculate the amount of acid to use in each titration. Assume that you are using 0.0512 M NaOH(aq). A good volume of NaOH(aq) to use per titration is 15mL. From this molarity and volume, the moles of NaOH can be calculated. Since the unknown acid

91. ## Calculus

Find the dervatives: 1. f(x)=(3x+1)e^x^2 2. y = e^(sin x) ln(x) 3. f(x)=(x^(2)+x)^23 4. f(x)=sin(2x)/cosx 5. square root of x/(3x+1) 6. f(x)=sin^4(3x=1)-sin(3x+1) 7. x+y=cos(xy) The answers I got: 1. 6x^(2)e^(x^2)+2xe^(x^2)+3e^(x^2) 2. e^sinx/x +

92. ## Math

An 8 meters bamboo pole is leaning against a coconut tree. The foot of the pole is 3 meters from the base of the tree. What angle does the pole make with the tree if the pole reaches up to the top of the tree? HELP PLEASE!

93. ## Physics

A little red wagon with mass 7.0kg moves in a straight line on a frictionless horizontal surface. It has an initial speed of4.00 m/s and then is pushed 3.0m in the direction of the initial velocity by a force with a magnitude of 10.0 N a.) Use the

94. ## Chemistry

The complete combustion of 1.283g of cinnamaldeyde (C9H8O, one of the compounds in cinnamon) in a bomb calorimeter (Ccalorimeter=3.841 kJ/C) produced an increase in temperature of 130.32 C. Calculate the molar enthalpy of combustion of cinnamaldehydy

95. ## earth

The global-mean surface temperature of the earth is about 288 degrees Kelvin. Use the Stefan-Boltzman law to calculate the radiative flux corresponding to an object with this temperature. [hint: use σT4 with σ = 5.67x10-8 Wm-2K-4 ]

96. ## math

meredith picked 4 times as many green apples as red apples. if she picked a total of 20 apples how many green apples did she pick?

97. ## Math

Mr Collins bowling league has 48 members. If the league splits into teams of 12 members each,how many equally sized teams will there be

98. ## Grammar, punctuation

Social history revealed that he lives with his aunt and uncle does not smoke or chew tobacco and reported drinking to intoxication once a month. My answer is; Social history revealed that he lives with his aunt and uncle, does not smoke or chew tobacco and

99. ## Literature

13. Scan this line from Cowley's poem: "its hills bent low within my reach." How many feet does this line contain? A. 5 B. 7 C. 6 [D. 4]

100. ## Grammar, punctuation

She experienced fever anorexia weakness and right-sided chest pain. I say the correct punctuation for this sentece is; She experienced fever, anorexia, weakness and right-sided chest pain.

101. ## science

if an object covers a large enough area of the water's surface, it can float on the water because of the________of water particles

102. ## chemistry ........................chemistry

Sodium Na+ Intense yellow Barium Ba++ Green Calcium Ca++ Brick red Copper Cu+ or Cu++ Blue-green Strontium Sr++ ? Lithium Li+ ? Sodium and potassium mixture Na+&K :yellow light Observations using the cobalt glass filter Sodium & potassium mixture

103. ## physics

Your physical therapist throws a baseball to you at a certain speed and you catch it. To increase the difficulty, the therapist is going to throw you a medicine ball whose mass is ten times the mass of the baseball. You are given the following choices.

104. ## Can you help me make my thesis sound clear & good

In the short story, "how much land does a man need," the author Leo Tolstoy would describe that human worth based on shallow measurements such as wealth and possessions make true love and humanity impossible because of greediness, the devil filling our

105. ## algebra

2st squared -s squared. S=4 t=8

106. ## Chemistry

Zinc dissolves in acid according to the balanced reaction: Zn(s) + 2H^+(aq) -> Zn^2+(aq) + H2(g) A sample of zinc is placed in the ice calorimeter. If 0.0657g of zinc causes a decrease of 0.109mL in the ice/water volume of the calorimeter, what is the

107. ## Calculus

Find dy/dx using implicit differentiation of xy + sin^2y=10350. Is it -y/(x+2siny)

108. ## College algebra

What is the domain for X³+2X²-9X-18

109. ## PHYSICS

A 0.26kg- rock is thrown vertically upward from the top of a cliff that is 32m high. When it hits the ground at the base of the cliff, the rock has a speed of 29m/s. 1) Assuming that air resistance can be ignored, find the initial speed of the rock ? m/s

110. ## Physics

A golf ball of mass 30.0 grams is struck by a 4.00 kg golf club for a time of 3.00 ms. If the golf ball obtains a velocity of 25.0 m/s after being struck then with what force did the club strike the golf ball? a. 2.50 N b. 7.50 N c. 250 N d. 750 N e. 25.0

111. ## Physics

A 0.40kg block is held against a compressed spring of stiffness 68.2N/m and compression 0.64m parallel to a 24 degree incline that is 1.27m long. The coefficient of kinetic friction between the block and the incline is 0.34. The external force holding the

112. ## Physics

A skier is gliding along at 5.0{\rm m/s} on horizontal, frictionless snow. He suddenly starts down a 15{\rm ^{\circ}} incline. His speed at the bottom is 15{\rm m/s} . What is the length of the incline? How long does it take him to reach the bottom?

113. ## Math

Janet drove 304 Kilometers and the trip took 4hours. How fast was Janet traveling?

114. ## physics

A spy in a speed boat is being chased down a river by government oﬃcials in a faster craft. Just as the oﬃcials’ boat pulls up next to the spy’s boat, both boats reach the edge of a 5.1 m waterfall. The spy’s speed is 17 m/s and the oﬃcials’

115. ## Language Arts

He fell like a leaf tossed down the wind, down, down, with one cry that overtook Daedalus far away. When he returned, and sought high and low for the poor boy, he saw nothing but the bird-like feathers afloat on the water, and he knew that Icarus was

116. ## Early Child Care

the ability to put an object or group of objects in a logical series based on a property of those objects is: A) seriation B) phonemic awareness C) classification D) attribution

117. ## Trig

From an observation tower that overlooks a runway, the angles of depression of point A, on one side of the runway, and point B, on the oppisite side of the runway are 6 degrees and 13 degreess respectivel. The points and the tower are in the same vertical

118. ## math

Use properties of logarithms to expand each logarithmic expression as much as possible. Where possible evaluate logarithmic expsressions without using a calculator. logb x^7

119. ## Physics

if you were on a 22.7 degree slope and an avalanche started 425 m up the slope, how much time would you have to get out of the way, there is no friction.

120. ## Chem II

What mass of oxygen gas exerts a pressure of 475 mm Hg in a volume of 1.25 L at a temperature of -22 degrees Celsius.

121. ## computer science

Write an Assembly program to determine the price of a car rental. The car being rented costs $45 per day and frequent renters get a$15 discount on the total bill. Get as input, the number of days rented and whether the user is part of the frequent renter

122. ## chemistry

2) Toluene, C6H5CH3, is a liquid similar to benzene, C6H6. It is the starting material for other substances, including trinitrotoluene (TNT). Find the molality of toluene in a solution that contains 25.8 g of toluene and 135 g of benzene.

123. ## Algebra

Give the domain of (f - g)(x) and (g of f)(x) where f(x)=3 -x and g(x) - ã(x)

124. ## algebra 1

A passenger plane and a jet leave att the same time from the same airport,traveling in opposite directions. The jet travels at twice the speed of the passenger plane. they are 2400 mi apart in 4 hours. Find the speed of the passenger plane and jet.

125. ## college orgo

calculate how to make 10 mL of 15:85 ethyl acetate:hexane solution from 2 mL of 5:95 ethyl acetate:hexane, using pure hexane and pure ethyl acetate.

126. ## grammar

If it tells you more about a noun, it’s a/an ________. A) adjective B) adverb C) noun D) pronoun E) verb I answered d

127. ## English

Identify the world in bold type. Do you know someone who can fix a lamp? (A) demonstrative pronoun (B) indefinite pronoun (C) interogative pronoun (D) relative pronoun (E) not a pronoun

128. ## physics

what frequency of sound travels in air @20 degree C has a wavelength equal to 1.7m?

129. ## Biology

How does long term survival of a species depend on resources that may be limited from time to time?

130. ## physics

A box of books weighing 324 N is shoved across the floor by a force of 527 N exerted downward at an angle of 35 below the hori- zontal. The acceleration of gravity is 9.81 m/s2 . If μk between the box and the floor is 0.59, how long does it take to move

131. ## math

there are 28 students in a class 16 are girls what fraction are boys

178. ## Math

If I make a porch that is 60 feet in length, 50 feet wide and 4 inches deep, how do I calculate the area, perimeter, and surface area of the porch? Can I multiply feet and inches in the same equation?

179. ## Physics

wo very small spheres are initially neutral and separated by a distance of 2.73 m. Suppose that 2.60E+13 electrons are removed from one sphere and placed on the other. What is the magnitude of the electrostatic force that acts on each sphere?

180. ## math

I am thinking of a number. If I add 4 to it, square the result, divide that result by 20, and subtract 4, the infal result is 1. What is my number

181. ## Statistics

Over a period of about nine months, 1,353 women reported the timing of each of their menstrual cycles. For the first cycle reported by each woman, the mean cycle time was 28.86 days, and the standard deviation of the 1,353 times was 4.24 days. (a)

182. ## social study

explian any three factor which lead to the incident known as bloody sunday

183. ## s.s.

who was the leader of the jacobin club?state any four laws indroduced by him

184. ## algebra

Using the equation y=-2x-5 a. The slope of this line is b. The y intercept of this line is c. The x intercept of this line is

185. ## Science 8R - Homework Qs. Check

If an object has mass of 70.5g and a volume of 64 cm(3), what is its Density? Will it sink or float and why? Answer - The Density of this object is 4512g/cm(3). It will sink because the amount of grams is a lot. Is the answer correct and good???? I

186. ## calculus

Differentiate: f(x)=(secx)/[1+sec(x)]

187. ## math

Suppose a certain economy's consumption function is as follows, where C(x) and x are measured in billions of dollars. C(x) = 0.76x^1.1 + 18.19 Find the marginal propensity to consume (dC/dx) when x = 7. (Round your answer to three decimal places.)

188. ## Physics

In a Physics laboratory class, an object of mass 2.1 kg, attached by massless strings to two hanging masses, m1= 1.0 kg and m2= 4.0 kg, is free to slide on the surface of the table. the coefficient of kinetic friction between m2 and the table is 0.30.

297. ## math

Find the following landmarks for 12,16,23,15,16,19,18

298. ## dounoon

(1) A sample of gas has a volume of 0.5 meter at 27 0degree and 1.5x10 Pa. What volume will this gas occupy if the temperature is raised to 117 0degree and the pressure lowered to 0.5x10 Pa.

299. ## math

y=(w-5)270 for w

300. ## Calc

deriv. y=x(sinx)(cosx)

301. ## science

changing the mass or volume of an object changes its density and ?

302. ## math

Someone said when you put together any groups, you can multiply. Explain why that is not correct.

303. ## US History

How would the French and Indian War first unite the colonists and then lead them to resent the British?

304. ## social studies

Are all aztecs able to wear feather headdress or just royalty and rich people?

305. ## English

What is can find in the following sentence: You can find properties of science in a basic clock. A. Main verb B. Helping verb C. Both D. Neither I say it is C Both, is this right?

306. ## Math

Change 300 mm3(cubed) to cm3(cubed). I have no idea how to work this out. Any help you can give me would be greatly appreciated!! Thanks

307. ## MATH

WALTER HAS A CAR PAYMENT OF 417.HOW MUCH WILL HIS CAR PAYMENTS TOTAL IN ONE YEAR?

308. ## Math

if the interest rate on a home mortgage is 9%, then each month you pay 0.75% of the unpaid balance in interest. if the unpaid balance on one such loan is \$60,000 at the beginning of a month, how much interest must be paid that month?

309. ## ENH275

How does a story employ verisimilitude?

310. ## s.s.

who is pinochet

311. ## s.s.

state the three demands of lenin's april theses?

312. ## Science

If Sam weights 114kg on earth what is his mass on the moon

313. ## calculus

differentiate: g(t)=tˆ3cos(t)

314. ## College Algebra

A piling supporting a bridge sits so that 1/4 of the piling is in the sand, 150 feet is in the water, and 3/5 of the piling is in the air. What is the total height of the piling?

315. ## Math

1/2 of class takes Spanish and 1/4 takes Chinese. 1/3 as many take French as Spanish. 8 takes French. No students takes more than one Language. How many takes Spanish? How many students take Chinese and how many students are in the class? Is this correct?

316. ## Calculus 1

differentiate f(x)=(1+sinˆ2x)ˆ6

317. ## Calculus

Find an equation of the tangent line to the curve of f (x) = x^3 − 8, at the point where the curve crosses the x-axis.

318. ## Grammar

A/an ________ and a connector is the same thing. A) conjunction B) preposition I answere B

319. ## aed 204

sexual harassment among students

320. ## Evolutionary Bio

Is Amborella considered a magnoliid, monocot, or eudicot and why?

321. ## grammar

Cowardice die many times before their death but brave once

322. ## Grammar

A relative pronoun is a connector, and the most commonly used relative pronouns are “that,” “which,” “who,” “whom,” “whose,” “whoever,” and “whomever.” True or False I answerd True

323. ## Math Rational Functions

What is the domain and range of 2x^2-18/x^2+3x-10

324. ## AP Calculus

if i define the function f(x)= x^3-x^2-3x-1 and h(x) = f(x)/g(x), then evaluate the limit (3h(x)+f(x)-2g(x), assuming you know the following things about h(x): h is continuous everywhere except when x = -1 lim as x approaches infinity of h(x) = infinity

325. ## math

when enlargeing sn object, why does the area increase diffrently than the preminter?

326. ## Math

What is the cube root of 192x to the 7th power?

327. ## social studies

what will obama do for for jobs, education and gun control? i am writing an persuasave essay in 6th grade and i need a fact about what obama will do for jobs education and gun control please make sure the facts are correct and NOT made up!

328. ## math

5/6 of 3 find the product

329. ## maths

what is prime triplet?

330. ## maths

x3+6x2+18x+13=0

331. ## geometry

solve for x if angle 1 and angle 2 are supplementary: angle 1= 5x+6 angle 2= 3x

332. ## math

write 8,042,176 in words

333. ## Math

How many 2/3 are in 3/4?

334. ## Religion

I need help interpreting this question, In Isaiah 38 how did Hezekiah feel when he found out he was going to die, some typical or expected things? thanks