# Questions Asked onApril 27, 2011

1. ## calculus

The sides and diagonal of the rectangle above are strictly increasing with time. At the instant when x=4 and y=3, dx/dt=dz/dt and dy/dt=k(dz/dt). What is the value of k at that instant. solved for z with pythagorean theorem and stuck at that step. z=5

2. ## CHEMISTRY HELP!

Consider the following reactions and their equilibrium constants. (NO(g) + 0.5Br2(g) NOBr(g) Kp = 5.3 2NO(g) N2(g) + O2(g) Kp = 2.1 x 1030 Use these equations and their equilibrium constants to determine the equilibrium constant for the following reaction:

3. ## Chemistry

Given that the specific heat capacities of ice and steam are 2.06 J/g degrees C and 2.03 J/g degrees C, respectively, calculate the total quantity of heat evolved when 10.0 g of steam at 200 degrees C is condensed, cooled, and frozen to ice at -50 degrees

4. ## Physics

The average coefficient of volume expansion for carbon tetrachloride is 5.81 10-4 (°C)-1. If a 43.0 gal steel container is filled completely with carbon tetrachloride when the temperature is 10.0°C, how much will spill over when the temperature rises to

Identify which of the following sentences uses modifiers correctly; a) kurt and his hockey teammates nearly cooked two hundred pancakes for the breakfast fundraising event. d) Bridget decided to leave her career as an attorney and pursue acting during the

6. ## chemistry

Use the Î”H°f information provided to calculate Î”H°rxn for the following: Î”H°f (kJ/mol) SO2Cl2 (g) + 2 H2O(l) â†’ 2 HCl(g) + H2SO4(l) Î”H°rxn = ? SO2Cl2(g) -364 H2O(l) -286 HCl(g) -92 H2SO4(l) -814

7. ## Linear Algebra

For which value of k does the matrix 8 k -9 -3 have one real engenvalue of multiplicity 2? Explain.

8. ## math

a local television station sends out questionnaires to determine if viewers would rather see a documentary, an interview show or reruns of a game show there were 350 responses with following results. 105 were interested in an interview show and a

9. ## Math

Given that force 1=60 pounds and force 2=90 pounds, find the angle between the forces if the magnitude of the resultant force is 50 pounds. Round answer to the nearest degree and show work.

10. ## chemistry

Balance the following redox equation occurring in a basic solution: AG + CN{-} + O2 = AG(CN)2{-} I tried...but this is wrong...2H2O+ AG + CN{-} + O2 = AG(CN)2{-}+4OH{-}... I am supposed to do half reactions...how do I spit the product AG(CN)2{-}?????

11. ## chem

At a certain temperature, the reaction CO(g) + 2H2(g) CH3OH(g) has Kc = 0.500. If a reaction mixture at equilibrium contains 0.00436 M CH3OH and 0.220 M H2, what is the equilibrium concentration of CO? The answer is 0.280 M. I don't know how to get it.

12. ## Chem

(a) The molar solubility of Ag2CrO4(s) at 35°C is 1.3 10-4 mol/L. Calculate Ksp. (b) If 0.0490 g of AgIO3 dissolves per liter of solution, calculate the solubility-product constant. (c) Using the appropriate Ksp value from Appendix D, calculate the

13. ## physics ---

A concave spherical mirror has a radius of curvature 15 cm. A 1 cm tall bulb is placed in front of the mirror such that its image is formed 10 cm in front of the mirror. If you measure distance from the optic center of the mirror, (A) What is the focal

14. ## Chemistry

The equilibrium constant, Kc is 3.2 x10 -34 at 25C for the reaction 2 HCl(g) H2(g) + Cl2(g). what is The equilibrium expression, Kc for the reaction

15. ## chemistry

What are the oxidation numbers for the elements in the compound C2H5COOH?

16. ## Math

A Candy box is made from a piece of cardboard that meaasures 11 by 7 inches. Squares of equal size will be cut out of each corner. The sides will then be folded up to form a rectangular box. What size square should be cut from each corner to obtain maximum

17. ## Chemistry

Although water and ammonia differ in molar mass by only one unit, the boiling point of water is over 100 degrees C higher than that of ammonia. What forces in liquid water that do not exist in liquid ammonia could account for this observation?

18. ## chemistry

se the information provided to determine Î”H°rxn for the following reaction: Î”H°f (kJ/mol) 3 Fe2O3(s) + CO(g) â†’ 2 Fe3O4(s) + CO2(g) Î”H°rxn = ? Fe2O3(s) -824 Fe3O4(s) -1118 CO(g) -111 CO2(g) -394

19. ## chemistry

How much energy is required to decompose 765 g of PCl3, according to the reaction below? The molar mass of PCl3 is 137.32 g/mol and may be useful. 4 PCl3(g) â†’ P4(s) + 6 Cl2(g), Î”H°rxn = +1207 kJ

20. ## Chemistry

What is the mass of carbon dioxide if 100 grams of methane is oxidized to carbon dioxide and water?

21. ## Physics

A trap door, of length and width 1.65 m, is held open at an angle of 65.0 degrees with respect to the floor. A rope is attached to the raised edge of the door and fastened to the wall behind the door in such a position that the rope pulls perpendicularly

22. ## chemistry plse help

Use the standard reaction enthalpies given below to determine Î”H°rxn for the following reaction: P4(g) + 10 Cl2(g) â†’ 4PCl5(s), Î”H°rxn = ? Given: PCl5(s) â†’ PCl3(g) + Cl2(g), Î”H°rxn= +157 kJ P4(g) + 6 Cl2(g) â†’ 4 PCl3(g),

23. ## Chemistry

A student mixed 75.0 mL of water containing 0.75 mol HCI at 25* C with 75.0 mL of water containing 0.75 mol of NaOH at 25*C in a foam cup calorimeter. The temperature of the resulting solution increased to 35*C. How much heat in kilojoules was released by

24. ## Chemistry

Strontium-85, used for bone scans, has a half-life of 64 {\rm d}.How long will it take for the radiation level of strontium-85 to drop to \frac{1}{8} of its original level?

25. ## Chemistry

The recommended dosage of iodine-131 is 4.20 \mu{\rm Ci/kg} of body weight. How many microcuries of iodine-131 are needed for a 84.0 {\rm kg} patient with hyperthyroidism?

26. ## math

A spinner is divided into 5 equal sections numbered 1, 2, 3, 4, and 5. If the spinner is spun and a coin is tossed, what is the probability of getting a tail on the coin and an odd number on the spinner

27. ## Chemistry

The normal boiling point of benzene is 80 degree C and its heat of vaporizations is 30.8 kj/mol. What is its boiling point at the top of Pikes Peak where P=260 mmHg?

28. ## Chemistry

ia 3ag2S+2AL = 6 ag +al2s3 a double replacement or single replacement

29. ## Physics

A disk with a rotational inertia of 7 kgm^2 rotates like a merry-go-round while undergoing a torque given by (5+2t)Nm. At time 1s, its angular momentum is 5kg m^2/s. what is its angular momentum at 3s? I can't figure out how to start this problem.

30. ## math

a restaurant offered pizza with 3 types of crust and 7 different toppings. how many different types of pizzas could be offered. 7 toppings on each i came up with 21 but not sure

31. ## math

a restaurant offered pizza with 3 types of crust and 7 different toppings. how many different types of pizzas could be offered?

32. ## Chemistry

Use Henry's law to determine the molar solubility of helium at a pressure of 1.5 atm and 25deg C.

33. ## Calculus 2

Write in cartesian form: r=3tan(theta)sec(theta) im working with this function here, trying to get an rcos(theta) and/or rsin(theta) so far, i am stumped. what i have so far: r^2=3r(tan(theta)sec(theta)) (x^2+y^2)=?????

62. ## Geometry

The scale factor for two similar triangles is 4 : 3. The perimeter of the smaller triangle is 12. What is the perimeter of the larger triangle?

63. ## Chemistry

The environmental protection agency allows 10 ppb concentration of arsenic in drinking water. If an 8 oz glass of water is at 10 ppb, how many ug of arsenic (As) is present? (8 oz= 236mL)

64. ## Statistics

A consumer protection group reports that 25% of 5-lb bags of sugar of a certain brand are underweight. Three bags of sugar are selected at random. Assume that the report is correct. a. What is the probability that all three bags are underweight? b. What is

65. ## World History

One cause of the Peloponnesian War was a. invasion of Athens by the Persians. b. invasion of Crete by the Mycenaens. c. conflict over control of the Delian League. d. economic and commercial rivalries among the city-states. D?

66. ## Math

Let X and Y equal the respective numbers of hours a randomly selected child watches movies or cartoons on TV during a certain month. From experience, it is known that E(X) = 30, E(Y) = 50, Var(X) = 52, Var(Y) = 64, and Cov(X, Y)= 14. Twenty-five children

67. ## Math

Find each number to the nearest tenth. What number is 66 2/3% of 45?

68. ## Chemistry

In the following reaction, how many grams of ammonia (NH3) will produce 300 grams of N2? 4NH3 + 6NO d 5N2 + 6H2O

69. ## math

A boat traveled 45 miles downstream (w/ the current) in 3 hours and made the return trop (against the current) in 5 hours. What was the speed of the boat and what was the speed of the current?

70. ## math

State whether the events described are independent or dependent and determine the probability: A card is pulled from a well shuffled deck of standard playing cards and is not put back in the deck. A second card is drawn from the deck. What is the

71. ## French

Guillaume voyage avec ______ soeur et _______ parents. i have to use " SON , SA, OR SES " as appropriate.

72. ## operations management

given the following information, provide an example of how much of farmers sausage gravy mix should be ordered. You are doing the order for thursday. service level 95%, and standard deviation of 3.5 units per week, and a moving average weekly demand of 35

73. ## physicss

an. Electron travels in a circular orbit of radius 0.5 a and frequency of 5.5*10^7hz. Findthe magnetic field produced At center

74. ## Programming Logic

I need to create a flowchart/psuedocode for a dice game that give you 2 rolls with 5 dice, 3 rolls per game. the computer will roll the 4 dice and calculate your score. my question is...do i need to repeat this 3 times and can i use nested loops and if

75. ## Spanish

26. "Luisa, te presento a la señora Ortega." "________" a. !Feliz cumpleaños! b. ¿Como estás? c. Ahora te conozco d. Encantada B? 27. Me encantan ______. Todos llevan algo muy divertido. a. las fiestas de disfraces b. los regalos elegantes c. los

76. ## algebra2/trignometry

in right triangle PQR,Q=90DEGREE,PQ=4 AND PR=7 WHAT IS ANGLE R TO THE NEARST TENTH OF A DEGREE

77. ## Math Word Problem

Need a formula for this math problem. Help!? Relinda owns a tea shop and is creating a new mix of tea for her customers. She is using a standard black tea that sells for $7 per pound and a special orange flavor that sells for$11 per pound. She is planning

78. ## maths

what volume of distilled water must be added to 165mls of stock solution to make 1200mls of diluted solution

79. ## government

According to the age-cohort tendency, significant changes in the pattern of political socialization is typically concentrated among: retired citizens. younger citizens. middle-aged citizens. citizens that have children.

80. ## Math

A consumer buys n light bulbs, each of which has a lifetime that has a mean of 800 hours, a standard deviation of 100 hours, and a normal distribution. A light bulb is replaced by another as soon as it burns out. Assuming independence of the lifetimes,

81. ## Chemistry

3.5 grams of Sodium Phosphate is mixed with 6.4 grams of Barium Nitrate. How many grams of Barium Phosphate will be produced?

82. ## english

Based on the readings in Ch. 3, identify key points to keep in mind when writing a topic sentence. How might these key points help you write effectively?

83. ## Math

A consumer buys n light bulbs, each of which has a lifetime that has a mean of 800 hours, a standard deviation of 100 hours, and a normal distribution. A light bulb is replaced by another as soon as it burns out. Assuming independence of the lifetimes,

84. ## math

Which of the following integrals computes the volume of the solid formed by revolving the region bounded by the graph of y = Ln(x), the x-axis, and the line x = 3 about the line x = 3?

85. ## Hcs 490

What effects or potential effects do technologically based communication modalitiesâ€”between patients and health care providers and between health care providers onlyâ€”have on health care costs? Discuss at least 2

86. ## public speeking

What might be some modern examples of speech styles that weren't discussed in the lecture? Defend why you consider these to be modern styles. In the lecture-new channels of speaking that have developed as a result of changes in technology. New forms of

87. ## Chemistry

What will be the molarity of the resulting solutions made by mixing the following? Assume that volumes are additive. 91 mL of 0.42 M HNO3 with 59 mL of 1.6 M HNO3 i know that i'm going to use the formula M1V1=M2V2, but i'm not sure what numbers to

88. ## World History

The Peloponnesian War began, in part, because of a. economic rivalries among Greek city-states. b. threats of invasion by the Mycenaens. c. alliances formed among Sparta, Persia, and Crete. d. arguments over control of the Delian League. A?

89. ## calculus

a cake is put into an oven to bake. the temp, H, of the cake (F) is a function of how long it has been in the over, t (min). thus, H=f(t) What does f'(t) represent? is f'(t) positive or negative? is f"(t) positive or negative?

90. ## Math

faizel wants to travel from his house to the hardware store that is six blocks east and five blocks south of his home. If he walks east and south, how many different different routes can he follow from his house to the store? Can somebody help me setup

91. ## Algebra

I am resubmitting - Simplify: 3x^2 y^6 Z^2 ------------ (dividided by) 4x^4 y^3 Z^4 my answer ?? 3y^2 ------- 4x^2 Z^2

92. ## Math(Probability) need help

Three drugs are being tested for use as the treatment of a certain disease. Let p 1 , p 2 , and p 3 represent the probabilities of success for the respective drugs. As three patients come in, each is given one of the drugs in a random order. After n = 10

93. ## Chemistry

How many Kilograms of water must be added to 5.0 grams of oxalic acid (H2C2O4) to prepare a 0.40 Molality?

94. ## geometry

If X = 10 cm and Y = 24 cm, what is the length of Z?

95. ## Chemistry

How many grams of bromine can be obtained by the decomposition of 92.0 of MgBr2?

96. ## Math

The line for the Dunking Machine was twice as long as the Cake Walk line. The line for the Cake Walk was one-third the length of the line for the Hoop Shoot. If there were 12 people in line for the Hoop Shoot, how many people were in the line for the

97. ## Chemistry

how many grams of CaCl2 would be required to be added to water to prepare 1 liter (1000 ml) of a 1.72% (w/v) aqueous solution of CaCl2?

98. ## Chemistry DrBob

I don't understand how you get the answer. I really don't understand any of this, how do I set it up with the numbers? once i get how to do this, then i feel i will understand how to set these up from here on out. so if you could, show all your work,

99. ## Math/117

Because we are working with exponents, your answer should be in exponential form. How would you respond to this problem including exponents? 3^5 * 3^5. What rule would you apply?

100. ## chemistry

If 0.075 g of MgF2 dissolves per liter of solution, calculate the solubility-product constant. I got 2.0e-9 but it was not correct.

101. ## Physics

A crowbar is used to wrench open a wooden crate. The crowbar is situated so that a point 8 cm from the end digging into the box acts as a pivot point. The crobar is gripped on the other side, 29 cm away from the pivot. If the person exerts a force of 110

102. ## Math

Jessica can jog to work in of an hour. When she rides her bike, it takes her of an hour. If she rides miles per hour faster than she jogs, how far away is her work?

103. ## Physics Class

A 166 g mass is attached to a horizontally mounted spring. It is pulled out to stretch the spring and then released. You determine the period of the oscilliation to be 1.0 seconds. What is the acceleration of the mass (magnitude) when the spring is

104. ## Chemistry

(A). A reaction with a known q is performed in a bomb calorimeter and is found that 10.0 kj of heat is required to raise the temperature of the calorimeter by 2.15 degrees C. calculate the heat capacity of the calorimeter. (B). When 1.00 g of C2H6(g) is

105. ## English

Thank you very much. I included my corrections in brackets, when necessary. 1)The front door is where Dr Jekyll is seen and represents his public face. 2)His friend moves like a guttering candle which is about to go out.He describes the face of his dying

106. ## Pre-Calculus

I need help on these problems they are from my study guide and i don't have a clue on how to do these 3 problems and if anyone can show the steps and somewhat explain the steps so i can do it myself next time. 1.) sin25‹cos35‹sin‹35 The answer

107. ## chemisrty

could freezing point depression be used for substances not soluble in water?

108. ## geometry/help

Find the area of a regular heptagon with the side 7 cm. answer 178.1 cm² can you check

109. ## Algebra

45x divided by 6t x 11x I have tried to work this out, however, do not understand it at all. The book gives an answer of (55x squared)t. Can anyone explain this to me? Thank you

110. ## Algebra

multipy & simplify 2a^2 b^3 x 4a^-3 b^-2 ---------- ------------ 2ab^4 9a^2 b My answer: 2 ------ 3a^12 b^24

111. ## geometry

given that BD and AC are perpendicular, what is the length of Ac? AB=9.4 BD=7.9 BC=23.2

112. ## chemistry

a reaction witha known q is performed in a bomb calorimeter and is found that 10.0 kj of heat is required to raise the temperature of the calorimeter by 2.15 degrees C. calculate the heat capacity of the calorimeter.

113. ## blair

Sitting motionless on a playground swing. The downward force is 500 n. How much force is there on each of the two swing chainsv

114. ## Chemistry

How do I balance the following into an equation? 10 mL of 2.0 M HCl is react with 8 mL of 1.7 M Ca(OH)2 in a neutralization reaction.

115. ## physicss

an. Electron travels in a circular orbit of radius 0.5 a and frequency of 5.5*10^7hz. Findthe magnetic field produced At center

Identify ways in which Mcdonalds is being socially responsible. To what point, u think Mcdonalds is being genuine in their concern and to what degree u believe this is public relations exercise made to improve Mcdonalds image. Support with evidence. This

117. ## Math

What are the dimensions of a square resulting from doubling the area of a square measuring 4 feet by 4 feet

118. ## algebra

Stacey throws two dice. The difference in face value between the two dice is three, and the product of the numbers thrown is equal to twice the sum of the two numbers. Show and solve an alebraic equation that finds the numbers Stacey threw.

119. ## comm

Read the summary paragraph on the bottom of p. 37. Identify the author’s goal in writing the paragraph. How effectively do you think the author met that goal? The paragraph is below. Hockenbury and Hockenbury tell us that daily hassles often cause more

120. ## English

As promised, I'm sending you 5 sentences I'm finding it difficult to change. Thank you. 1)In the second stanza there is the description of a gas attack toward the trenches: a white fog raises up suddenly. While the poet manages to wear the gas mask,

121. ## HCS/457 - PUBLIC AND COMMUNITY HEALTH

Why is it important to consider the components of the social ecology framework in community and public health?

122. ## Chemistry

What is the formula for measuring turbidity?

140. ## Pre Chem

How much heat will be produced when 16grams of C2H6 burns? The reaction is 2 C2H6 + 7 O2 --> 4CO2 + 6 H20 triangle heat = -350kJ

233. ## Family Structure

1)Do you think Western marriages would last longer if they were arranged by parents? Why or why not? 2) What type of family do you think will be the norm 50 years from now? Why?

234. ## Geometry

Why is the apothem of an equilateral triangle its one third height?

235. ## Algebra

I am really having problems with monomials: Please help! Simplify: 4x^2 y^3 Z ----------- (divided by) 5y^4 Z^3 is the answer 4x ------ (divided by) 5yz^2

236. ## Chemistry

A solution is prepared by adding of KOH to 1 liter of water. The resulting solution has an [OH negative]of 1 * 10 negative 3. What would be the pOH of this solution? Can you show me how you came up with this answer? Thank you.

find an expression for the magnitude of the initial velocity that a projectile must possess in order to leave the earth when air friction is negelcted. The gravitational constant is given as G= 6.67428*10^-11 m^3 kg^-1 s^-2 Please give lots of details in

238. ## math

If you received an annual salary of \$22,500.00 paid monthly, what would your gross pay be each pay period?

239. ## physics

what is the speed of light moving through a medium of index refraction 2.45?

240. ## calculus

how to integrate surd (1+4x^2)?

241. ## English

I forgot to include the following corrections I did myself. 1)In this way, the signs of age and corruption appear IN the picture. He makes a reflection (he meditates upon) about the sadness of war. He dreams of his dying friend. He describes his friend’s

242. ## english

what is the pro noun in this sentence... I like baseball most of all.

243. ## Math

True Or False A.16-(3+5)=18 B.(4+2)*5=30 C.100%(25+25)+5=7 D.15-4*3+2=35 E.(40-2*2)%6=6

244. ## chemistry

a reaction witha known q is performed in a bomb calorimeter and is found that 10.0 kj of heat is required to raise the temperature of the calorimeter by 2.15 degrees C. calculate the heat capacity of the calorimeter.

245. ## Math

I need help solving this using U- Substitution (x^2-4)^2 + (x^2-4) -6=0

246. ## Australian Legal Studies

Explain the process of amending the Australian Constitution. Give details of events leading up to the 1999 referendum and explain its outcome. Outline some of the other issues Australia faces with constitutional reform.

247. ## English

I forgot to include the following sentences. I need to express the following ideas using fewer coordinate clauses. Thank you. 1)In the second stanza there is the description of a gas attack toward the trenches: a white fog raises up, suddenly, and while

248. ## PRECALCULUS

factor x^3 - 2x^2 + x - 2

249. ## English

Thank you very much. I included my corrections in brackets (nearly always). 1)I can't understand one of your corrections: he wishes the portrait would grow old in his place (why is "grew old in his place" wrong?) 2)Beauty has got a divine right of

250. ## English

I did the corrections myself. I included them in brackets. Can you see if they are correct? Thank you. 1)The subject of the poem is the description of some soldiers while they are retreating through (toward) their trenches. 2)They should be young and

251. ## chem

how many moles of water are present in one mole of zinc sulphate and write the formula for this?

252. ## Jiskha

I can't find my last spanish post from yesterday... Also, the search box now doesn't take me to my most recent post if I type in "mysterychicken" like it used to; why not? Thanks -MC

253. ## math

Compute the following limit: sqrt x+4 -2/x lim x-->0 the x+4 is the only thing under the square root. the answer is .25, but id like to know how to work this out

254. ## Math

A right circular cylinder with a height of 20 cm and a right circular cone share a circular base and have the same volume. What is the height of the cone?

255. ## Math

find an expression for the magnitude of the initial velocity that a projectile must possess in order to leave the earth when air friction is negelcted. The gravitational constant is given as G= 6.67428*10^-11 m^3 kg^-1 s^-2 Please give lots of details in

256. ## Math

My choices are a. a large paper clip b. The width of your hand c. The length of your arm d. Your height

257. ## Sociology

How do social scientists help people face the prospect of death and the sadness of a loved one?

258. ## math

Could someone work this out so I understand it. Thanks Solve: 6^x = 1/36 x =

259. ## english

what is the adverb in the following sentence. These birds swoop down to catch fish scraps.

260. ## Math

I have a math problem i need help with. Thank you. Problem: let's say there is a 15% chance of getting strep if you are exposed to a person with strep. Let’s say there is a 50% chance that you were exposed. a) What is the probability that you will get

261. ## algebra

If 1/8 = 12 1/2% what percent does 3/8 equal?

262. ## Government

Can the president veto the choice of congress's salary?

There are three crowns in the royal cabinet: One for the King, One for the Queen, and one for the Princess. The king's circumference was 21.98 in, the Queen's circumference was 43.96 cm and the Princess' circumference as 392.5 mm. What are the Diameters's

264. ## chemisty

calculate the molarity of a solution with .2 moles of sodim hydroxide dissolved in .5L of water

265. ## English

Slaughter House Five For whatever reason, Billy cannot tell his wife, Valencia, about his Dresden experiences but fluidly recounts minute derails to Montana Wild hack. Why is this? Is she form of earth mother? A fantasy for bored, middle-aged married men?

find the equivalent spring constant for a system of two spring of constant k 1 and k2 connected in series .use your result to explain to explain what happens when a sprin g of constant k is cut into two equal halves

267. ## help Fast ( physics)

a 0.5 m^2 solar collector radiation from the sun and focuses it on 250g of water that is inially at 23 degrees . the average intensity of radiation arriving from the sun at this location is 550 Wm^-2. if you assume that this is collected with 100%

268. ## Cab someone help me below?

can someone help me below with the question i poisted i don't understand i need help thanks!

270. ## Math

What is the reduced fraction of 8/15?

271. ## calculus

f(x)=2x+3; on [0,4] with 4 subintervals

272. ## Criminal Justice

Could some please help me with this? I am not sure what to really say. Thanks! Describe the historical development of police agencies and their jurisdiction. Thanks so much for the help!

273. ## REWORDING

exploit the masses Need help rewording

274. ## Pre-Calculus

How do I solve, in radians and degrees, 2-3sin(3(x-pi))=6?

275. ## algebra

2(8u+2)=3(2u-7)

276. ## algebra

You choose a head coach and an assistant from a group of 12 applicants. How many different groupings are possible?

277. ## Math(Probability)

The joint p.m.f. of X and Y is f(x, y) = 1/6, 0 ≤ x + y ≤ 2, where x and y are nonnegative integers. (a) Sketch the support of X and Y. (b) Record the marginal p.m.f.’s f1(x) and f2(y) in the “margins.” (c)Compute Cov(X, Y). (d)Determine ρ,the

278. ## Algabra

I need help solving this using U- Substitution (x^2-4)^2 + (x^2-4) -6=0

279. ## compound predicates

how do you use the word evaporate in a compound predicates?