1. chemistry

Consider the reaction, C2H4 (g) + H2 (g)- C2H6 (g) where -137kJ of heat is released. How many kilojoules are released when 55.3g of C2H4 reacts?

2. Physics

Determine the stopping distances for an automobile with an initial speed of 95km/h and human reaction time of 1.0s: (a) for an acceleration a= -5.2m/s^2 (b) for a= -6.7m/s^2

3. chemistry

a sheet of gold weighing 10.0g and at a temperature of 18.0 degrees c is placed flat on a sheet of iron weighing 20.0g and a tenp. of 55.6 degrees c. what is the final temp. of the combined metals? assume that no heat is lost to the surroundings.

4. physics

A space vehicle accelerates uniformly from 50m/s at t=0 to 182m/s at t=1 0.0s. How far did it move between t=2.0s and t=6.0s?

5. chemistry

a 500ml sample of oxygen gas at 24 degree celsius was prepared by decomposing a 3% aqueous soution of hydrogen peroxide in the presence of manganese catalyst by the reaction: 2h2o2 = 2 h20 + o2... the oxygen was colletec by displacement of water. the total

6. English Grammar

Each of the following sentences has an agreement error in it. Match the correct type of agreement error to the sentence: The patient was placed in the wheelchair with the fractured tibia. Although they seemed inflamed, the site of the previous craniectomy

7. Calculus

Find the largest and smallest values of the given function over the prescribed closed, bounded interval of: f(x)=(3x-1)e^-x for 0

8. math

A raffle has a \$500 first prize, two \$100 second prizes and five \$25 third prizes. If 500 tickets are sold for \$5 each find the expected value of buying a single ticket.

9. CAL

(1 pt) A spherical snowball is melting in such a way that its diameter is decreasing at rate of 0.3 cm/min. At what rate is the volume of the snowball decreasing when the diameter is 8 cm. (Note the answer is a positive number).

10. physics

A space vehicle accelerates uniformly from 70 at t = 0 to 172 at t = 10.0. How far did it move between = 2.0 and = 6.0 ? So I used the forumla d=vt+.5a(t)^2 but for a i got 10.2 since a=(172-70)/10 Now im stuck for v, what do i put for v?

11. Chemistry

a tank contains a mixture of 3.0 mol of nitrogen gas, 2.0 mol of oxygen gas and 1.0 of carbon dioxide gas at 25 degrees celsius and a total pressure of 10.0 atm. Calculate the partial pressure in torr of each gas in the mixture?

12. chemistry

By using the bond enthalpies and bond energies in thermochemical equations to calculate the reaction enthalpy of; H + Br=2HBr

13. physics

Determine the stopping distances for an automobile with an initial speed of 95km/h and human reaction time of 1.0s: (a) for an acceleration a= -5.2m/s^2 (b) for a= -6.7m/s^2

14. Physics

A truck travels at a constant speed of 28.0 m/s in the fast lane of a two-lane highway. It approaches a stationay car stopped at the side of the road. When the truck is still 1.2x10^2 m behind the car, the car pulls out into the slow lane with an

15. Chemistry

Oxygen has a boiling point of 90K, and nitrogen has boiling point of 77K. Which is a liquid and which is a gas at 80K? I tried to look into the phase diagrams, but I still don't understand. Can somebody please help and explain to me??? THANKS A LOT!!!

16. English Grammar

Each of the following sentences has an agreement error in it i.e. Verb tense agreement error, Subject/verb agreement error. Pronoun agreement error, Modifier placement error, Parallel structure error. Match the correct type of agreement error to the

17. arithmetic

find the 25th term of the arithmetic sequence 24, 19, 14, 9 ...

18. English Grammar

The following sentences has an agreement error in it. Match the correct type of agreement error to the sentence: The patient was placed in the wheelchair with the fractured tibia.

19. chemistry

How much heat (in ) is evolved in converting 1.00 of steam at 150.0 to ice at -55.0? The heat capacity of steam is 2.01 and of ice is 2.09 .

20. English Grammar

Each of the following sentences has an agreement error in it i.e. Verb tense agreement error, Subject/verb agreement error. Pronoun agreement error, Modifier placement error, Parallel structure error. Match the correct type of agreement error to the

21. Physics

A marathon runner runs at a steady rate of 15 km/h. When the runner is 7.5 km from the finish, a bird begins flying from the runner to the finish at 30 km/h. When the bird reaches the finish line it turns around and flies back to the runner, and then turns

22. american government

The presidents role in foreign policy increased largely because: A. Congress proved so inept in foreign affairs that the american people demanded a change. B. America became more of a world power. C. of the need to coordinate national economic policy and

23. chemistry

2 liquids a and b have vapour pressure of 500 mm hg and 200 mm hg .calculate mole fraction of a at which 2 liquids have equal partial pressure

24. physic

A person stands on a bathroom scale in a motionless elevator begins to move,the scale briefly reads only 0.75 of th person regular weight(means Fn=0.75mg).Calculate the acceleration of the elevator,and find the direction of acceleration.

25. chemistry

How much heat (in ) is evolved in converting 1.00 of steam at 150.0 to ice at -55.0? The heat capacity of steam is 2.01 and of ice is 2.09 .

26. Algebra

Use the five steps for problem sovling. Company A charges \$25 per month plus \$0.22 per minute for cell phone service. Company B charges \$35 per month plus \$0.12 per minute. How many minutes of usage is needed in one month to make Company B a better deal?

27. chemistry

Benzene has a heat of vaporization of 30.72kJ/mol and a normal boiling point of 80.1 C. At what temperature does benzene boil when the external pressure is 490 ? I think I have the equation setup, but I can't figure out how to solve for T2..please help

28. algebra 2

x^3+10x^2+31x

29. chemistry

Strontium has density of 2.64 and crystallizes with the face-centered cubic unit cell. Find the radius of the strontium atom

30. algebra II

the profit made when t units are sold, t > 0, is given by P=t^2-36t+320. Determine the number of units in order for P > 0 (a profit is made).

31. college math

The atmospheric pressure P in pounds per square inch (psi) is given by the formula below, where a is the altitude above sea level (in miles). If a city has an atmospheric pressure of 13.25 psi, what is its altitude? (Recall that 1 mi = 5,280 ft. Round your

32. statistics

If someone scored two Standard Deviations above the Mean on a standardized test where the Mean = 100 and the Standard Deviation = 15, then that person’s numerical score would be…?

33. CAL

The altitude of a triangle is increasing at a rate of 2500 centimeters/minute while the area of the triangle is increasing at a rate of 4000 square centimeters/minute. At what rate is the base of the triangle changing when the altitude is 11500 centimeters

34. american government

It can be said of regulatory commissions that: A.the commissioners pursue independent and impartial policies, regardless of politcal pressure from democrats or republicans in congress. B. unlike presidential appointees in other areas, regulatory heads

35. Chemistry

2NaF + CaCl2 ¨ CaF2 + 2NaCl An excess of 0.20 M NaF is used to precipitate the calcium ions from a 50.0 mL sample of a calcium chloride solution. What is the concentration of the original calcium chloride solution?

36. chemistry

what is the Molarity (M) of a 0.87m aqueous solution of ammonia, NH3? The density of the solution is 0.823 g/mL. Answer: 0.71 M So I have: 0.823 g H2O+NH3/1 ml H2O+NH3 17.034 g NH3/1 mol 18.016 g H2O/1 mol 0.87 mol NH3/1 kg H2O I've tried this several ways

37. math

The length of a swimming pool is 22 ft. The width is 40 ft. If the volume of the pool is 2,500 ft³, which equation below could be used to find the depth of the pool?

38. sociology

The creation of minority group status largely depends on:

39. Probability

Start with a standard, uniformly shuffled 52-card deck, and draw the cards one at a time. What is the probability of drawing a King strictly before getting a Spade?

40. help me to construct this in a good essay

English 101AYR has now been in session for four weeks. In at least one full screen (one paragraph rather than an essay), answer the following question: Has your opinion about hybrid courses changed from day one to today? If yes, in what ways has it

41. CAL

At noon, ship A is 30 nautical miles due west of ship B. Ship A is sailing west at 21 knots and ship B is sailing north at 15 knots. How fast (in knots) is the distance between the ships changing at 4 PM? (Note: 1 knot is a speed of 1 nautical mile per

42. chem

If a 250 mL sample of water was cooled from 50.0˚C to 25˚C, how much heat was lost (in joules)?

43. SAT Math

A container in the shape of a right circular cylinder contains 12 liters of liquid when it is filled to 3/4 of its height. How many liters does it contain when it is completely filled?

44. algebra

Which of the following expressions has 3 terms? 8x + y - z xyz y^3 + 1

45. biology help

Is photosynthesis only occurring during the daytime? What happens when there is no light? What is the relationship between light dependent and light independent reactions in photosynthesis?

46. Math

Using correct mathematical notation and symbols, express the following in set-builder notation: Z = {16, 17, 18, 19, 20} I'm so confused with this....please help :(

47. english

I have to write two paragraphs, with a total minimum word count of 350 words, explaining what your point of view will be on credit card companies should not be on campus marketing to college students, and what you plan to accomplish in you paper

48. Math-Can u help me Reiny?

An electronics store surveyed every 8th customer who came into the store for a week. Of the 380 people who responded, 185 people watched movies on VHS tapes. 251 people watched movies on DVDs. 72 people watched movies both on VHS tapes and DVDs. i. Of

49. social psychology

3. Perceiving yourself to be a target of discrimination and prejudice can affect you negatively. Citing two (2) examples of each, explain how this may happen 4. Images of a new self can motivate us to change. Identify a “Desired Possible Self” and

50. calculus 1

I just need help getting started. I can't figure out the equation I need to use! An airplane passes over an airport at noon traveling 500 mi/hr due West. At 1:00 pm, another airplane passes over the same airport at the same elevation traveling due North at

51. Math

How many positive 3-digit integers contain only odd digits?

52. Physics

On a recent ski trup to Vermont, Mr Backman wanted to beat Mr S's ski jump recor. Mr B left the ski jump ramp with an initial velocit of 37.0 m/s and angle of 27 degrees from the horizontal. a) What is the maximum height theat Mr B reaches above the jump

53. Spanish

El abuelo de Guillermo le cuenta sobre un viaje en barco a Espana. Completa el parrafo con por o para. Cuando fui a Espana (12____) primera vez, se viajaba (13____). Estuve en el oceano (14____) diez dias (15____) una tormenta horrible. Pero, (16____) ser

54. algebra

mang pedring want to build square table the length is 30cm. longer than its height.... how would you represent the height of the table?

55. accounting

purchase office supplies worth 50000.paying 20000 and 30000 on accounts.what is the debit and credit entry?

56. Math

Simplify the following expression, and rewrite it in an equivalent form with positive exponents. 24x^3y^-3/72x^-5y^-1 My answer was going to be: 24/72*x^3/x^-5=y^=3/y^-1

57. Math probabilty

An amusement park, Dino World, considering adding some new attractions, conducted a study over several typical days and found that, of 10,000 families entering the park, 1020 brought just one child (defined as younger than age 12), 3370 brought two

58. Physics

A ball is thrown with initial velocity Vo=20.0 m/s from the top of a 50.0m tall building. Find the velocity Vg with which the ball strikes the ground. Find time Ttotal it takes for the ball to move to the ground.

59. calculus 1

I found the equation which was the pythagoras theorem and then took the derivative of the equation but not sure what to plug in where. Oh and I found C(t) to be 743.30 An airplane passes over an airport at noon traveling 500 mi/hr due West. At 1:00 pm,

60. MATH

A company makes three products X, Y and Z. Each product requires processing by three machines A, B and C. The time required to produce one unit of each product is shown below. Product X:- Machine A: 1 Machine B: 2 Machine C: 2 Product Y: Machine A:2

61. Math

A manufacturer makes two products A and B, each of which is processed in two departments, production and finishing. Each A takes 3 hours to produce and six hours to finish, whereas each B takes 5 hours to produce and 2 hours to finish. How many units of A

62. chemistry

I have a unit cube question to which the answer is given that I'm trying to figure out. The question is: If under conditions of high pressure & temperature, the crystalline structure rearranges to form a face-centered cubic unit cell, what is the new

63. stats

In each of the four examples listed below, one of the given variables is independent (x) and one of the given variables is dependent (y). Indicate in each case which variable is independent and which variable is dependent. I. Gas consumption; Miles driven

64. math

use implicit differentiation to find the slope of the tangent line to the curve (y)/(x-7y)=x^6+5 at the point (1,6/43)

65. Physics

1. A person driving to the right and honks their horn. An observer standing behind the car, opposite its direction of motion would hear...(choose one) a. Higher Pitch b. Lower Pitch c. Same pitch as the driver please explain how you got to the answer

66. statistics

calculate the probability that a randomly selected student is a female if they are at most 30 years of age, there are 27 females out of 57 students.

67. chemistry

Given the reaction of hydrogen and chlorine gases, calculate the moles of hydrogen that react to produce 4.20 mol

68. intermediate algebra

combine like terms. write all answers in order 9b^5+3b^2-2b^5-3b^2

69. intermediate algebra

find two algebraic expressions for the area of each figure. first ,regard the figure as one large rectangle, and then regard the figure as a sum of four smaller rectangles 3 t,t,5

70. Physics

A cannon placed at the top of a 100.0 m high cliff fires horizontally to a platoon of Hussars situated initially 1.0 km away from the base of the cliff. At what initial velocity should the cannon shell be fired assuming the hussars are moving with a

71. physics

A space vehicle accelerates uniformly from 70 at t = 0 to 172 at t = 10.0. How far did it move between = 2.0 and = 6.0 ? So I used the forumla d=vt+.5a(t)^2 but for a i got 10.2 since a=(172-70)/10 Now im stuck for v, what do i put for v?

72. biology

What are coupled reactions? Describe the interactions between enzyme, substrate, active site and the induced fit model Explain how changes in temperature, and pH affect the function of enzymes Recognize the structure of ATP, and be able to identify some

73. Statistics

foofy computes the correlation between an individual's physical strength and his or her college grade poing average. Using a computer, the correlation for a sample of 2000 people is r(1998)=+.08, p=

74. Statistics 343

A sample has a mean of 120 and a standard deviation of 20.0. Find the value of x that corresponds to each of these standard scores: a. z = 0.0

75. Finance

A firm has debt with a market value of \$40 million and an equity value of \$160 million. The rate the firm pays on its det is 8% and on its equity is 13%. The corporate tax rate in 35%. There firm s considering a project with the following cash flows: Year

76. geography

How do a country's size and shape affect its power and stability?

77. biology help

Does photosynthesis require energy? What type of energy reaction would photosynthesis be? Is photosynthesis an example of a coupled reaction?

78. soc 207

. The nuclear industry is placing ads in popular magazines and newspapers, claiming that nuclear power is environmentally friendly, since it doesn’t contribute to the greenhouse effect. How do you respond to that claim?

79. World History

1. Among early hunting and gathering peoples, the commonly occurring mark that looks like a "P" is thought to stand for a A. favored animal B. woman. C. powerful male leader. (my answer) D. symbol for a calendar. 2. Charles Darwin supported the theory that

80. Chemistry

If you produce 3.63 moles of Na2, how many moles of H2 was needed?

81. Chemistry

A 5.00L steel cylinder is filled with water vapor at 650mmHg and 100C. Calculate the density of the gas.

82. @SraJMcGin Spanish

El abuelo de Guillermo le cuenta sobre un viaje en barco a Espana. Completa el parrafo con por o para. Cuando fui a Espana (12____) primera vez, se viajaba (13____). Estuve en el oceano (14____) diez dias (15____) una tormenta horrible. Pero, (16____) ser

83. Child Psychology

In comparison to concordance rates for autism in dizygotic twins, monozygotic twins are _______ likely to develop the same illness. A. significantly less C. significantly more B. somewhat less D. somewhat more

84. chem

I have a titration of 30ml of .360 M H2C6H6O6 Its K1 =6.8E-5 K2 =2.8 E-12 With .280 M NaOH. It is a weak acid being titrated by a strong base Its a two step process with the ice table to find the eqpts. Ineed to list the volumes of NaOH needed for the

85. Child Psychology

Which of the following statements is the simplest way to describe respiratory distress syndrome to someone who wants to understand it? A. It’s a cluster of breathing problems that often affects premature infants. B. It’s a breathing disorder mothers

86. algebra

simplify by removing the factors of 1 p^2-4/(p+2)^2

87. Social Studies

When (gerrymandered) elections are conducted, all voters in a state choose from the same pool of candidates. Gerrymandered is the underlined term. True or False? I know it's false but I'm not sure which term to replace it with. I think it's at-large

88. chemistry

what is the starting temperatue of 150ml of gas when cooled to 33 degrees of celsius and a volume of 120ml?

89. Math

“On Monday afternoon Kelly withdrew 5% of the balance of her bank account to loan her friend some money. On Tuesday morning she deposited \$100 into her bank account. She now has \$25 more than she did on Monday morning. How much was in her bank account

90. Math ( Algebra)

Short Answer: Raise the quantity in parentheses to the indicated exponent, and simplify the resulting expression. Express answers with positive exponents (-33xy^-1/66x^0y^-3)^2

91. social psychology

Women have lower self esteem than men. Discuss how personal attitudes can affect or promote self-esteem, citing two (2) specific examples for each gender

92. Algebra 2

write the standard form of the equation of the circle withthe given radius (8,0) and whose center is the origin

93. statistics

calculate the probability that a randomly selected student is taller than 5 feet5 inches in height. there are 31 students out of the 57 students who are 5 feet 5 inches in height. I just want to know how to set this problem up.

94. intermediate algebra

simplify. -2x^5(x^7)+(x^3)^4-(4x^5)^2(-x^2)

95. Physics - Work

A tennis racket is in contact with a 55 kg ball for 0.0050 s changes the ball's velocity from 30 m/s [E] to 40 m/s [W] over a distance of 0.0001 m. how much work is done on the tennis ball by the racket?

96. math

In 1995, the life expectancy of males in a certain country was 62.1 years. In 1999, it was 65.7 years. Let E represent the life expectancy in year t and let t represent the number of years since 1995. what is the linear function? Use the function to

97. physics

Using the inverse-square gravitational law, calculate the work required to lift a 1000-kg satellite from the earth's surface to an altitude of 100 mi and inject it into orbit at 17,500 mph. How long would a 300-hp engine have to be run to produce this much

98. Power generation

need help 2. Large central power stations typically have a power output capacity of 1000 MW and convert about 35 percent of the input energy to electricity. Consider such a plant that burns coal with an energy content of 24 MJ/kg. 1. How much coal (tons)

99. american government

As distinct from the patronage and executive leadership system, the merit system for managing the bureaucracy A. allows the president to appoint top officials of executive agencies,thus making the bureaucracy more responsive to election outcomes. B.

100. Physics

he United States is currently considering standards to generate 20% of its electricity from renewable resource in the next 15 years. If this power is generated by wind turbines that generate 3 MW each, how many turbines will need to be installed in the

101. Math

Raise the quantity in parentheses to the indicated exponent, and simplify the resulting expression. Express answers with positive exponents (-33xy^-1/66x^0y^-3)^2 This is the answer i am getting from TRYING to follow my online book. Please Help Me. Thank

102. physics

a body thrown vertically upward returns to the earth in 3sec what was the initial velocity of the body? what height did the body reach? neglect the resistance of air. The answer after solving is 14.7m/s and 11m. please tell me how the answer is arrived.

103. Basic Algebra

if 5 is added to a number and the sum is tripled, the result is 27 more than the number. Find the number

104. algebra II

x^3+10x^2+31x

105. algebra II

use alaytical and graphical methods to solve the inequality. (3x+6/7x^2+5) > 0

106. Physics

A pilot maintains a heading due west with an air speed of 24o km/h. After flying for 30 min, he finds himself over a town that he knows is 150 km west and 40 km south of his starting point. a) Waht is the wind velocit, in magniture and direction? b) What

107. algebra

Solve the system. y=x+1 y=-2x+7 x= y=

108. physics

A car starting from rest and moving with variable acceleration possess average velocities 5m/sec, 10m/sec, 15m/sec in the first seconf and third seconds. What is the total distance covered by the car in these three seconds?

109. Physics

A horizontal force presses the block of mass 10kg to the wall. What is the minimum magnitude of the applied force which can hold the block on the wall without accelerating it down if the coefficient of static friction (pico per second) between the block

110. Math

Express the following in roster form: Set M is the set of natural numbers between fourteen and nineteen.

111. chemistry

Which has more grams of NaCl? A 2 molar solution in 2 Liters, or a 3 molar solution in 1.5 Liters?

112. statistics

I need to post some thought on using either the multiplication rule or probability to answer a question on my online statistics.

113. Child Psychology

In terms of development, Piaget believed that A. child development is haphazard, random, and based on experience. B. cognitive development proceeds by stages that are universal across cultures. C. children learn in different sequences based on their

114. MATH

A manufacturer produces three types of radios: deluxe, standard and economy. Each radio uses three different types of transistors: P, Q and R. The deluxe radio uses 2 P's, 7 Q's and 1 R. The standard contains 2 P's, 3 Q's and 1 R, and the economy model

115. Math-Is this right Reiny?

Using correct mathematical notation and symbols, express the following in set-builder notation: Z = {16, 17, 18, 19, 20} {x | 15 < x < 20, x ∈ N}

116. Child Psychology

Researchers have concluded that A. the proportion of REM sleep to N-REM sleep is similar in infants and adults. B. REM sleep provides needed brain stimulation to neonates. C. REM sleep is mostly absent in neonates. D. the proportion of REM sleep to N-REM

117. chemistry

If I have CH3-CH3 and it undergoes a combustion reaction, what will be the products?

118. chemistry

Why can’t ethyne be turned into trans or cis isomers?

119. science

in which of the following materials is the velocity of light greatest

120. english

can someone help me revise/edit my anthropology survey paper Here is my paper attached to the question: Sociology in general, is the study of societies and groups of people that have familiar backgrounds, interests, or institutions. Some examples of

121. Math

Simplify the following expression squareroot -14 squareroot -56 (My answer is going to be 7)

122. algebra

A number consists of two digits. The sum of twice the tens digit an 5 times the units digit is 19. If the digits are reversed, the new number is 54 less than the original number. Find the number

123. Algebra

simplify the following expression and rewrite it in an equivalent form with positive exponents 24x^3y^-3/72x^-5y^-1 24*3*3*3/72*-5*-5*-5*-5*-5= This is how I have it started on my paper. my online book is down and im stuck. Thank you.

124. Macroeconomics

If GDP increases by 5 percent in the same that the deficit is run, What happens to gross debt as a percentage of GDP? What happens to the level of debt held by the public as a percentage of GDP? deficit was \$300 billion

125. algebra 2

1) In the general second-degree equation Ax^2 + Bxy + Cy^2 + Dx + Ey = F = 0, what is the discriminant and what does it tell you about the graph of the equation? 2) Which terms in a general second-degree equation (Ax^2 + Bxy + Cy^2 + Dx + Ey = F = 0) are

126. human services

where might I find the answer to this question. Ethical dilemmas that are faced in a drug rehabb center for women.

127. algebra 1

what is an equation of the line containing the given point and prallel to the given line; (5,-2);6x-7y=4

128. math

factorize 1) x^2=5x-6 2) 6x^2-20=-7x 3) 6x^2-7x=-2

129. educational statics

the average SAT score at a local university is (=60, and standard is (x=50. Assume that the university SAT score has a normal distribution convert a student score x=700 into z score

130. ACT

What do you think is an efficient way to study for the ACT on your own?

131. Physics

1)Consider a contour map for the region around a hilltop. a) at some point on the map, in which direction ( relative to the contour lines) is the direction of steepest ascent. b) what can you say about spacing of contour lines versus the steepness of the

132. history

!@#\$%^& the presidemcy of thomas jefferson.do his action in office coincide with his political philosophy?

133. algebra

evaluate: 7x + [x - (5 - x)]

134. Probability

A 30 year old can buy \$25,000 life insurance for \$15/month. If the probability that the 30 year old will die is 0.14% find the insurance companies expected profit for the policy. (I want this in terms of their annual expectation-not monthly expectation)

135. chemistry

Which has more alcohol? 200 mL of 3.2 % vol/vol beer or wine with 7% vol/vol alcohol and a volume of 100 mL?

136. math 1A

hey im having trouble with these math problem . if a=2 and d=7 6d-3a =? how do you solve and get the answer ?

137. chemistry

If I put a red blood cell into pure water it will swell and burst, why is this?

138. chemistry

Which of the following will lie flat on a plane? Methane, ethane, ethene, ethyne, chloromethane?

139. math

Simplify −(−6a^3 + 0.2a^2 − 7)

140. English

Lying in a Hammock at William Duffy's Farm in Pine Island, Minnesota? What is the significance of this poem? What does the author mean by the last line? I don't understand what this poem is about and any help would be greatly appreciated! Over my head, I

141. Math

The table below shows the number of hours required in each of two departments to make one unit of various products A, B and C. For example, product B requires 1 hour of time in department I and 3 hours in department II. HOURS REQUIRED PER UNIT OF PRODUCT

142. algebra

simplify by removing the factors of 1 p^2-4/(p+2)^2

143. statistics

For a particular sample of 63 scores on a psychology exam, the following results were obtained. First quartile = 47 Third quartile = 81 Standard deviation = 11 Range = 68 Mean = 70 Median = 71 Mode = 77 Midrange = 55 Answer each of the following: I. What

144. Math

A restaurant offers a \$20 dinner deal. Dinners share one of 4 appetizers, get 2 of 6 entrees and share one of 3 desserts. How many dinners can be selected? (To make it easier, let’s assume they don’t pick 2 of the same meal)

145. algebra

Darians IRA has fallen 12.6% to 142,500.49. What was the value of her IRA at the beginning of the year?

146. bio

would these substances pass easily through the pores of dialysis tubing? and EXPLAIN why. 1-glucose 2-na^+ 3-insulin 4-estrogen 5-hydrogen ion

147. ehtnics

Describe, as if you were a member of that subordinate group, where the group originated, how it came to the United States, and one or two locations in the United States where members of your group live. Be creative in your fictional descriptions, and

148. social psychology

Women have lower self esteem than men. Discuss how personal attitudes can affect or promote self-esteem, citing two (2) specific examples for each gender

149. Algebra

Use the five steps for problem solving. Enrollment at a particular online university is 11,600. There are seven times as many students who work full time as there are students who do not. How many students work full time and how many do not?

150. math

simplify the following expression and rewrite it in an equivalent form with positive exponents 24x^3y^-3/72x^-5y^-1 Thanks!

151. Algebra

It is possible for a quadratic equation to have no real-number solutions:Solve : x2 + 5x + 3 = 0

152. science

what is motion?

153. math

The average (arithmetic mean) of x and y is m, where m does not equal to 0. What is the average (arithmetic mean) of x, y, and z? a.)m b.)4/3m c.)3/2m d.)5/3m e.)2m

154. algebra

evaluate: 7x + [x + (5 - x)]

155. math

Dirk Nowitzki of the Dallas Mavericks has a 87.7% career free throw record. Assuming that free throws represent independent events, find the probability of Nowitzki a. Getting 3 free shots in a row b. Missing exactly one of 3 free shots

156. Management

When examining the average salary of a job, it is advisable to consider the size of the companies used in the analysis and apply the ____ statistic to calculate the appropriate amount.

157. Economis

Name some goods that were at one time free goods are now economic goods?

158. math

An inlet pipe on a swimming pool can be used to fill the pool in 28 hours. The drain pipe can be used to empty the pool in 42 hours. If the pool is one-third filled and then the drain pipe is accidentally opened, how long will it take to fill the pool?

159. chemistry

If I have 80 grams of NaCl in 100 grams of water at 20 C, is that undersaturated, saturated or oversaturated?

160. chemistry

If the H+ concentration goes from 1.0 x 10-5 to 2.0 x 10-4 moles/Liter what will happen to the pOH?

161. algebra

Simplify −(−6a^3 + 0.2a^2 − 7) Thank you for helping me with this one :)

log 7 (80)

163. Math

Can the word "SLIME" be played from the letters I, E, N, L, S, T, R as the first move in a Scrabble game? Explain your answer

164. chemistry

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

165. chemistry

If I change the number of protons in Magnesium from 12 to 13 and make a new element, what is that process called?

166. chemistry

What kind of conditions would I want if I wanted to get as much CO2 to go into a soda as I could?

167. chemistry

How many isomers of CH3-CH2-CH3 can I make?

168. Stats

Can you tell me what ∑xy means? Like is in the sum of all x times y or what?

169. math

A 30 year old can buy \$25,000 life insurance for \$15/month. If the probability that the 30 year old will die is 0.14% find the insurance companies expected profit for the policy. (I want this in terms of their annual expectation-not monthly expectation)

170. his103

How was the Mediterranean Society under the greeks and Romans alike and different?

171. Math

Simplify the following expression; express in terms of i. squareroot -44 (My answer was 8i and I don't think that is right) Thanks A bunch

172. Algebra

Use the five steps for solving problems Enrollment at a particular online university is 11,600. There are seven times as many students who work full time as there are students who do not. How many students work full time and how many do not?

173. Algebra

Use the five steps for problem sovling. Christy’s plan for a rectangular dog pen is too small. The perimeter needs to be more than 118 feet. If the width should be nine feet shorter than the length, what should the length be?

174. stats

For a normal distribution where mx= 80 and sx= 10, the distribution model fits well to test scores of N = 20000 students.

175. algebra 2

write the standard form of the equation of the circle that passes through the given point (8,0) and whose center is the origin

176. chemistry

How to find the pH level in solid soap using an experiment?

177. math

a. 13/35 = 1/5 27/73 = 2/3 16/64 = 14 b. 4/5+2/3=6/8; 2/5+3/4=5/9; 7/8+1/3=8/11 c. 8 3/8 – 6 ¼ = 2 2/4 5 3/8 – 2 2 3 = 3 1/5 2 2/7 – 1 1/3 = 1 1/4 d. 2/3*3=6/9; 1/4*6=6/24; 4/5*2=8/10

178. math

factorizr. 1) x^2=5x-6 2) 6x^2-20=-7x 3) 6x^2-7x=-2

179. grammar

what is the compound subject of the following sentence tamara and janet served soup and salad at the luncheon

180. Grammar - to Leslie

http://www.jiskha.com/display.cgi?id=1310266925 See my last response.

181. MATHS

Does anyone have a full answer to question 7 in the Australian Mathematics Enrichment, Noether??? The one about inequalities

182. MATHS

Does there exist a five digit number abcde such that it is equal to the sum of the cubes of its digits a^3+b^3+c^3+d^3+e^3??? Must have detailed answers.

183. History-Civil War

What was the most important technological or technical advance made during and for the Civil War ?

184. educational statics

how often does the university admit an exception student with a SAT score of x =700 or above Asample of 36 students (N)- 36 were randomly selected with mean (=11,and standard deviation (x=12. the sample mean score X=9.

185. MATHS

prove that (x+y)^3-(x-y)^3-6y(x^2-y^2)=8y^3