# Questions Asked onMarch 25, 2010

verify the identity sin(4u)=2sin(2u)cos(2u)

2. ## math

you need 4/5 cups of water for a recipe. You accidently put 1/3 cups into the mixing bowl with the dry ingredients. How much more water in cups do you need to add?

3. ## chemistry

what is the conjugate base of H2SO3??

What is the angular momentum of a 2.5 kg uniform cylindrical grinding wheel of radius 19 cm when rotating at 1200 rpm? And how much torque is required to stop it in 5.7 s? Need help with step-by-step explanation.

5. ## physics

A 5.00-kg object placed on a frictionless, horizontal table is connected to a cable that passes over a pulley and then is fastened to a hanging 9.00-kg object. Draw free-body diagrams of both objects. Find the acceleration of the two objects and the

6. ## Chemistry

Calculate the [h3o+] of the following polyprotic acid solution: 0.135 M H2CO3

7. ## physics

A bowling ball of mass 7.3 kg and radius 9.6 cm rolls without slipping down a lane at 3.4 m/s. Calculate its total kinetic energy. I tried this problem with the equation 3/4mv^2 but I did not get the correct answer, could I please get help with

8. ## Chemistry

How many mL of 0.225M HCl would be required to titrate 6.00 grams of KOH?

9. ## microeconomic 2

given, STC=0.5^2 -10q -200 SMC=q-10 what is the short run average n marginal cost curve. i saw similar question posted by twitty...but i need to know how to get the answer...all the calculation..plz...

10. ## Pre-Cal

Find two functions f and g such that (f X g)(x) = h(x). (There are many correct answers.) h(x) = 4 / (5x + 2)^2 = My answers were: f(x) = 4 / 5x, and g(x) = 5x + 2 Please explain. These answers were wrong and I do not know how to fix them!!

11. ## social studies

The orginal purpose of the 1787 convention in Philadelphia was to: a. discard Articles of confederation b. revise the articles c. draft a new consitution d. discuss the future of the northwest territory

12. ## Pre-Cal

Determine the domains of (a)f and (b) f X g f(x) = 1/x g(x)= x + 3 For the domain of f I had x > 0 and for f X g I had all real numbers but this was wrong.

13. ## To Ms. Sue

Ms. Sue you know the English paragraph I was working on right, well I got some feedback on it from two of my friends and this is what they said. the 1st one said: Positive Things She liked my 2nd sentence, and she liked the way I used rapidly. Negative

how do you do average

15. ## English

What are some literary devices (simile, metaphor, flashback, etc.) that are used in the song, "A whole new world" from Aladdin?

16. ## Chemistry

What is the density of carbon monoxide gas at 127 celcius and 763 mm Hg?

17. ## Pre-Cal

Find (a) f X g , (b) g X f, and (c) f X f f(x) = 3sqrt x-1 g(x) = x^3 + 1 For the f(x) the 3 is little above the sqrt sign. my answers were: (a) = 3sqrt x^4 -1 (b) = x^4 -1 (c) = 6sqrt x+1 These answers are wrong but I do not know how to do this

18. ## physics help!

A small 520-gram ball on the end of a thin, light rod is rotated in a horizontal circle of radius 1.5 m. Calculate the moment of inertia of the ball about the center of the circle. Then calculate the torque needed to keep the ball rotating at constant

19. ## Chemistry

An amino acid has the form shown at R-CH-C-O^- (with a NH2 bonded to the CH and a O double bonded to the C) (O^- means the C has a negative charge) a) a pH of 7.0 b) any pH other than 7.0 c) a pH greater than its isoelectric point d) its isoelectric point

20. ## It

what is data management technology

21. ## Math 30

A popular game show begins with the host reading a question to the contestants. One question involves putting 4 events (A, B, C, and D) in chronological order. What is the probability that the contestant gets the question correct is he or she just guesses?

22. ## College Chemistry

Given the following equilibrium constants, Ka (NH4^+)=5.6*10^-10 Kb (NO2^-)=2.2*10^-11 Kw=1.00*10^-14 determine the equilibrium constant for the reaction below at 25*C. NH4^+(aq)+NO2^-(aq)f HNO2(aq)+NH3(aq)

23. ## Economic

1. Keogh and IRA plans allow people to do all of the following except A.save money each year for retirement. B.withdraw money from their accounts at the end of every year without penalty. C.establish their own pension plans. D.defer taxation of the

24. ## Chemistry

why are the orbitals of the hydrogen atom described as probability maps? Why are the edges of the hydrogen orbitals sometimes drawn to appear "fuzzy"?

25. ## more physics

a 1.00-kg object is observed to accelerate at 10.0m/s∧2 in a direction 30.0 north of east. the force F2 acting on the object has magnitude 5.00 N and is directed north. determine the magnitude and direction of the force F1 acting on the object.

26. ## Math

Bob and his dad visited the hardware store on Saturday. They observed the following transactions: Mr. Harris bought 4 for $0.50, Mrs. Clarke bought 21 for$1.00, Mr. Montaro bought 1,134 for $2.00, and Ms. Park bought 450 for$1.50. What were they buying?

27. ## Chemistry

Can you determine the mass of carbon monxide that is produced when 45.6 grams of methane reacts with 73.2 grams of oxygen gas. Can you please show work in detail please. Thanks

37. ## Math

On three consecutive passes a football team gains 7 yards, loses 34 yards and gains 24 yards. What number represents the total net yardage? For this would I just add 7+34+24 or is there a formula I should use?

38. ## Math

plumber needs four sections of pipe 2 7 8 feet long. Can this be cut from a 12 foot section? If so, how much pipe will be left over? If not, why not?

39. ## chemistry

An alpha particle (mass = 6.6 × 10-24 g) emitted by radium travels at 3.4 × 107± 0.1 × 107 mi/h. What is its de Broglie wavelength (in meters)?

40. ## Probability (Pre-Calculus)

A class is given a list of eight study problems from which five will be part of an upcoming exam. If a given student knows how to solve six of these problems, find the probability that the student will be able to answer: (a) all five questions on the exam.

41. ## Science

If the sun is in the center of the constellation Sagittarius on January 10, what time does it rise and set?

42. ## English

what are some things that you wouldn't want to hear during a surgery? -Oops! -Don't tell him/her! -Are you still alive? -Oh No! -Where did my gum go? Any other suggestions?

43. ## Science-PsyDAG

PsyDAG, could you please check my post on that science experiment thing, if you have time. I posted it yesterday on here, but you were never on. Thanks:-)

44. ## spanish

Complete with the appropriate word: 1. Cuando empieza el segundo ______, los jugadores vuelven al campo. 2. Juegan futbol en el ______ de futbol. 3. El jugador ________ un tanto cuando ___________ un gol.

45. ## Chemistry

An amino acid will have the form shown at: R-CH-C-OH (with an O double bonded to the C and a NH3+ bonded to the CH) a) a pH of 7.0 b) any pH other than 7.0 c) a pH greater than its isoelectric point d) its isoelectric point e) a pH less than its

46. ## social studies

why wasn't the articles of confederation adopted for 5 years?

47. ## COM 220

What type of writitn style does the author use in the article A Nation Apart?

48. ## social studies

The northwest ordinance provided for all of the following except: a. the eventual creation of three to five states out of the Northwest Terrirtory b. a prohibiton on slavery c. freedom of whorship d. discuss the future of the northwest territory

49. ## math

which of these equations represents that 5 less then 10 a number is 15? A)10n - 5 = 15 B)5n - 10 = 15 C)(5-10)n = 15 D 5- (10 + n) = 15 i think its (C)

50. ## finance 200

· Complete the following problems (Do Not repeat the questions): 1. The Monley Corporation of New Jersey has gross profits of $980,000 and$260,000 in depreciation expense. The Majors Corporation of Nebraska also has $980,000 in gross profit, with$60,000

51. ## Chemistry

will 1 molar NH3 and 1 molar NH4Cl form a buffered solution?

52. ## social studies

The Articles of confederation were nto adopter for fives because: (A) the antifederalists waged a stiff battle against them (B) disputes continued over western lands (C) the large states and the small states could not agree on representation (D) the

53. ## social studies

the southern states supported the Virginia Plan because: (A) it created a system of national courts (B) the legislature wa s to be apportioned according to a state's population (C) the upper house was to be elected by the state legislature (D) a large

54. ## algebra

how do i simplify the following: 2x^2 +13x +15 over 4x+6 . I simplified 4x+6 to 2(2+3), but I can't remember how to simplify the top part. Please help

55. ## health

What is sex???? And how are babies made???

105. ## Chemistry

Whatis the pH of a buffer that results when 0.05mol of Na3PO4 is mixed with 0.75 mol of HCl and diluted with water to 1.00L. (The acid dissociation constants for phospohoric acid are Ka1=7.5*10^-3, Ka2=6.2*10^-8 and Ka3=3.6*10^-13).

106. ## Pre-Cal

Give the domain of the function and identify any vertical or horizontal asymptotes. h(x) = 1 / x - 3 + 1 I had x = 0 and y = 3. Would the domain be all numbers except 1?

sandys classroom has tables that are shaped like trapezoids. three tables are placed together in a u-shape.One student can sit at the short base of the trapezoid or at the end of the table.two students can sit at the long base of the trapezoid. how many

a{n}=n(3n+5)

109. ## Chem

A buffer contains 1.0mol CH3CO2H and 1.0mol CH3CO2^- diluted with water to 1.0L. How many moles of NaOH are required to increase the pH of the buffer to 5.10? (pKa oof Ch3CO2H=4.74)

110. ## health care

how do participation contracts represent financial opportunities for providers?

111. ## math

Explain how to evaluate x-8 when x=10?

112. ## Math - Implict differentiation

How do I find the value of d^2y/dx^2 for the function defined implicitly by xy^2 + y = 2 at the point (1,-2)?

113. ## calculus 1

At noon, ship A is 30 nautical miles due west of ship B. Ship A is sailing west at 18 knots and ship B is sailing north at 19 knots. How fast (in knots) is the distance between the ships changing at 3 PM? (Note: 1 knot is a speed of 1 nautical mile per

114. ## Economic

Please I would to know if I choose the correct answer. Which of the following characteristics does perfect competition share with monopolistic competition? a)Price-taking firms b)Zero long-run economic profit c)homogeneous product d)some barriers to entry

115. ## calculus 1

At noon, ship A is 20 nautical miles due west of ship B. Ship A is sailing west at 21 knots and ship B is sailing north at 18 knots. How fast (in knots) is the distance between the ships changing at 5 PM? (Note: 1 knot is a speed of 1 nautical mile per

what is the conjugated base of H2SO3

117. ## chemistry

what is conjugated base of NH4+

118. ## AP Chemistry

In 1.33L container, 4.20 AB3, is heated to 400C, and 2.98x10-2(negative 2) moles of A is present at equilibrium. AB3(g) A(g)+ 3B(g) (28.23amu) (a.) Write the expression for K (b.) Calculate the equilibrium concentration of the following gases (i.) B (ii.)

119. ## math

The function H descibed by H(X)=2.75X+71.48 can be used to predict the height, in centimeters, of a woman whose humerus (the bone from the elbow to the shoulder) is x cm long. Predict the height of a woman whose humerus is 39 cm long. I have an answer of

120. ## Chemistry

Combustion analysis of 0.343 g of a compound containing C, H, and O produces 0.753 g of CO2 and 0.411 g of H2O. Mass spectral analysis shows that the compound has a molar mass around 120 g mol-1. What is the compound's: Empirical Formula:----- Molecular

121. ## science

The molecule Al2(SO4)3 has dissolved in water. What ions are formed and how many ions are formed of each type?

122. ## Calculus-math

If g(x) is the inverse of f(x), g(x)=f^-1(x), such that g(3)=5 and f'(5)=4 what is the value of g'(3)????? :O 2. If g(x)is the inverse of f(x), g(x)=f^-1(x), such that f(3)=15,f(6)=3,f'(3)=-8,and f'(6)=-2. What is the value of g'(3)???????? Calculus--

123. ## arithmetic

2.75+.003+.158=

124. ## algebra

Take any number (except for 1). Square that number and then subtract one. Divide by one less than your original number. Now subtract your original number. You reached 1 for an answer, didn’t you? How does this number game work? (Hint: Redo the number

125. ## Science

What are 2 things that electrical energy can transform into?

126. ## biology

What are the storage and quick energy forms of carbohydrates found in animals, and how are these forms structurally related to each other?

127. ## biology

Insects that live on land have a coating of wax on the outer surface of their body. What function might this wax serve for these animals?

128. ## To Ms. Sue

Ms. Sue can you Please edit this; I'll accept any other changes made by you, thanks. Can you please edit this in paragraph mode; it's easier for me to pick out the mistakes I've made that way. Thank You:-) I feel the pain of pins and needles. I open my

129. ## Biology

What is the process of cellular respiration and why is it so important? Thank you.

130. ## Biology

What is the process of cellular respiration and why is it so important? Thank you.

how much potential energy does a 4500kg piano is suspended by a rope 30 meters above the ground

132. ## college chemistry

a student did an alkalinity determination correctly,except that the sample titrated had a volume of 90.0 mL. Volume A was found to be 4.50 mL and Volume B was 7.00 mL. 1)Calculate the Alkalinity value from these data and then calculate the correct

133. ## English(college)

Can you please help me? The direction goes as follows; Edit the following sentences to correct errors in pronoun reference. In some cases you will need decide on an antecedent that the pronoun might logically refer to. 1) Our German conservation group is

134. ## chemistry

When a monoprotic weak acid is titrated with a strong base, the titration curve contains these many inflection points: a.zero b.one c.two d.three Can you also explain why you choose your answer to this question...thanks

135. ## Calculus

Lef f be the function defined by f(x)=x^3+x. If g(x) is the inverse of f(x), g(x)=f^-1(x) and g(2)=1, what is the value of g'(2)?

136. ## Chemistry

How many mL of 0.225M HCl would be required to titrate 6.00 grams of KOH?

137. ## Ethics

I am supposed to have a 1,400- to 1,750-word autobiographical research paper analyzing the influences of race as it relates to my community. Need to write a first-person account of how human interactions in my community have been racialized. For the

138. ## Chemistry

What is the pH of a 0.200M solution for HBrO? Ka = 2.8 x 10^-9

190. ## algebra

(x-3)(x+7)=(x+5)(x+1)

191. ## math

could someone please help. given each set of data for ∆ABC: a) solve for b given ∠B=88 degrees,a=31.5m,c=25.6cm b) solve for a given ∠B=66 degrees,∠C=28 degrees,c=11.6cm i) state whether the sine law or cosine law is required to solve the unknown

192. ## essay

i'm writing a persuasive essay about teachers giving students too much homework. i need 2 more supporting topics 1. interfering with activities 2. 3. please help and thank you

193. ## English

After school, I go to a drama club. There are a lot of clubs in my school, like a sports club and an art club. (In the sentences, what is the use of 'a'? Is it for a generic use or does 'a' mean just 'one'?)

194. ## math

A triangular lot sits at the corner of two streets that intersect at an angle of 63 degrees. One street side of the lot is 35m and the other is 47m. how long is the back of the lot, to the nearest metre?

195. ## math

133, 115, 120, and 111 passengers on four shuttle flights between Los Angeles and San Francisco during 1 day. What was the total number of passengers?

196. ## pre-calculus

How do i know if a conic section is a circle, ellipse, hyperbola, or parabola? based on it's equation such as 4x^2 - y^2 + 24x + 4y + 28 = 0

197. ## Precalculus(NEED HELP ASAP PLEASE!!)

Solve: sin(theta)cos(theta)-sin(theta)−cos(theta)+1 = 0, 0 < or equal to theta < 2pi Solution Set: ____________ ?

198. ## Precalculus(NEED HELP ASAP PLEASE!!)

Solve: sin(theta)+cos(theta) = 1 0 < or equal to theta < 2pi Solution Set:__________ ?

199. ## COM/105

How do prewriting activities like brainstorming and topic selection differ for individuals and teams?

200. ## COM/105

How should difficult issues like plagiarism be addressed—and why would these techniques be appropriate?