# Questions Asked onDecember 30, 2011

1. ## math

If tan(xy) = x, then dy/dx =

2. ## Finance

Danny Joe borrows \$10,500 from the bank at 11 percent annually compounded interest to be repaid in six equal annual installments. The interest paid in the first year is: \$_________. (Please calculate the arithmetic solution and show your work)

3. ## finance

14. Assume Julian has a choice between two deposit accounts. Account A has an annual percentage rate of 7.55 percent but with interest compounded monthly. Account B has an annual percentage rate of 7.45 percent with interest compounded continuously. Which

4. ## Trigonometry

Prove that sin(A-B)/cosAcosB + sin(B-C)/cosBcosC + sin(C-A)/cosCcosA = 0

5. ## Algebra 2

You are designing a kit for making sand castles. You want one of the molds to be a cone that will hold 48π cubic inches of sand. What should the dimensions of the cone be if you want the height to be 5 inches more than the radius of the base?

6. ## Trigonometry

Prove that cos(A+B)cosC - cos(B+C)cosA = sinBsin(C-A)

7. ## Chemistry

1) A compound has the following percentages by mass: barium, 58.84%; sulfur, 13.74%; oxygen, 27.43%. Determine the empirical formula of the compound. 2) If a 1.271-g sample of aluminum metal is heated on a chlorine gas atmosphere, the mass of aluminum

8. ## math

A farmer grows only pumpkins and corn on her 420-acre farm. This year she wants to plant 250 more acres of corn than pumpkins. How many acres of each crop should the farmer plant?

9. ## Math,Ratio

the ratio of the number of marbles Zali had to the number of marbles Muthu had was 3:4.Muthu gave half of his marbles to Zali.what was the new ratio of the number of marbles Zali had to munber of marbles Muthu had? pls give your answer clearly

10. ## Government

The Supreme court is most likely to grant a hearing when a case involves: A.an issue of state law as opposed to an issue of federal law. B.an issue of private law as opposed to an issue of public. C.an issue that is being decided inconsistently by the

11. ## Precalculus

I'm trying to verify the identity: (sin^2 x)/(2)= (secx-1)/(2secx)

12. ## Math

Write 84 as a product of a prime number

13. ## physics

A bullet of mass 0.45kg is fired from a gun of mass 9kg,the bullet moving with an initial velocity of 200meter per sec. Find the initial backward velocity of the gun.

Please check: 1.Write in expanded form: this is a sigma notation- 4 on top signma in middle k=1 on bottom to right of sigma is (k-1)(k-2) I solved: k=1 (1-1)(1-2)=0(-1)=0 K=2 (2-1)(2-2) = 1(0)=0 k=3(3-1)(3-2)=2(1)=2 k=4 (4-1)(4-)=3(2)=6 answer: 0+0+2+6 2.

15. ## social studies 9

make five observations about life in the backwoods of upper Canada. what jobs did pioneers do for themselves that we would never think of doing for ourselves today? PLLEZZZ HELPP CAN YOU ANSWER IT I DON'T NO WAT TO WRITE FOR THIS QUESTION

16. ## chemistry

In an exothermic reaction, delta H was found to be -40 kJ, and the activation energy to be 30 kJ. What would be the activation energy of the reverse reaction?

17. ## math

The vertices of quadrilateral ABCD are (A(1,1), B(1,5), C(5,5) and D(7,1). You want to transform ABCD into a parallelogram by only moving point B. A parallelogram is a four-sided figure with both pairs of opposite sides parallel. What should be the new

18. ## chemistry

An endothermic reaction was found to have an activation energy of 100 kJ. If this reaction is reversed, the activation energy is only 20 kJ. What is the value of delta H for the endothermic reaction?

19. ## chemistry

how do i calculate the number of moles of ammonium iron (ll) sulphate (NH4)2 Fe(SO4)2.6H2O in 1dm3 of solution?

20. ## chemistry 30

Consider the following reaction: 2NO(g)+O2(g)-->2 NO2(g)+ energy if the number of moles of oxygen is increased to two moles, the a. reaction speeds up b. reaction slows down c. temperature increases d. temperature decreases

21. ## math

James travels 624 miles in 8 hours ona train at a constant rate of speed. How many miles does he travel in 3 hours?

22. ## physics

A bullet of mass 0.45kg is fired from a gun of mass 9kg,the bullet moving with an initial velocity of 200meter per sec. Find the initial backward velocity of the gun.

23. ## Math

800cm3 of water is poured into an inverted right conical vessel and the water level is 6cm. How much more water has to be added to the vessel such that the water level becomes 9cm?

24. ## Question

I'M CURIOS SO DON'T JUST JUDGE ME AND BE RUDE i'M REALLY CURIOUS AND i FORGOT TO ASKED THIS QUESTION. DO NOT JUDGE ME!!!! Do I start taking SAT's and ACT's in grade 10th or 11th/12th grade???? I'm really curious.

25. ## Math

Mrs brown wants to tile her kitchen floor the tiles are 3 Inches on each side. The floor is 10 feet by 15 feet. How many tiles does she need?

26. ## math

Explain how to solve: Sam is ordering pizza. Tony's Pizza charges \$7 for a large cheese pizza plus \$.75 for each additional topping. Maria's Pizza charges \$8 for a large cheese pizza plus \$.50 for each additional topping. For what number of toppings will

27. ## Trigonometry

Prove that sin(n+1)Asin(n-1)A + cos(n+1)Acos(n-1)A = cos2A

28. ## chemistry

3.5 moles of steam at 100 C are condensed at 100 C and the resulting water is cooled to 42.3 C. Calculate the entropy change for this process.(The molar heat capacity of liquid water is 75.3 J mol1 K1, and the molar enthalpy of vaporisation of water is

29. ## Algebra 1

What is the y-intersept of a line with the equation 10y= 5x + 20?

I had to use the past tense of either poder or saber to write each sentence 1. tú y yo/mirar la televisión Tú y yo pudimos mirar la televisión. 2. nosotros/viajar Nosostros pudimos viajar. 3. los muchachos/jugar al fútbol Los muchachos pudieron jugar

31. ## chemistry 30

Catalytic converters in automobiles are used a. only to burn uncombusted gasoline b. only to convert carbon monoxide to carbon dioxide c. only to convert nitrogen oxides to nitrogen and oxygen d. all of the above

32. ## statistics

A college professor believes that students take an average of 15 credit hours per semester. A random sample of 24 students in his class of 250 reported the following number of credit hours that they were taking:

33. ## Algebra 2

Hey how would you factor this polynomial to find the zeroes of this function? x^4-5x^3+7x^2+3x-10

34. ## Hardwork I done already! :)

7th Grade 7th grade Grades (1st quarter to 4th quarter): English 7 - 99 Math 7 - 91 Social Studies 7R - 91 Science 7R – 80 Fine Art 7 (advance art) – 100 Strings 7 – 100 Gym 7 and 8 – A GPA: 1st Quarter – 93.50 2nd Quarter – 3rd Quarter – 4th

35. ## Maths

How many points would there be if you needed to draw a 21 lined mystic rose

36. ## Math

It took mike 2 2/5 hours to drive home. His sister drove same distance in 3/8 of mikes time how long did the drive take mikes sister?

37. ## Statistics

2. You are given the following data. Number of Absences Final Grade 0 93 1 90 2 79 3 66 4 60 5 56 - Find the correlation coefficient for the data. - Find the equation for the regression line for the data, and predict the final grade of a student who misses

38. ## MATH

For which value of x will the fraction 7/2x-6 be undefined? HOW TO DO THIS ?

39. ## ALGEBRA 1 help

If three times a number is decreased by 5, the result is 7. Find the number. IS THIS RIGHT ? 3x -5 = 7 +5 +5 __________ 3x = 12 ___ ____ 3 3 x=4 IS THIS CORRECT

40. ## maths urgent

1/5 of J's money is equal to 1/3 of S's money. The difference in their amount is 1/2 of A's money. If Adam gives \$120 to S, S will have the same amount of money as J. How much do the 3 people have altogether?(please show me a model method, not algebra)

41. ## Government

The contention that constitution contains moral language that justifies the vigorous protection of individual rights by the judiciary is a view compatible with: A.judicial restraint. B.judicial activism. C.analytical jurisprudence. D.precedent-based

42. ## chem

What happens to a catalyst in a reaction? a. it remains unchanged b. it is incorporated into the products c. it is incorporated into the reactants d. it evaporates

43. ## chemistry 30

A chemical reaction taking place on the surface of a block of sodium will not occur faster if the a. size of the block doubles b. block is cut in half c. surface area is increased d. amount of sodium is decreased

44. ## math

What is 20% of \$1300?

45. ## Geometry

A city has a scale model of the solar system nearly 6 km long. The model's scale is 1 km : 1 billion km. a. Earth is 150,000,000 km from the Sun. How many meters apart are Earth and the Sun in the model?

46. ## Math,Ratio

a sum of money is shared between Alice,Gahya&Sita in the ratio 3:2:4.if Gahya receives \$4287.50,how much money do Alice and sita receive altogether?

47. ## Math,Ratio

Mrs Koh bought some tuna and sardine from a fishmonger.the ratio of the mass of tuna to the mass of sardine was 1:2.if she bought a total of 12kg of fishes,find the mass of each type of fish that she bought

48. ## Algebra

Suppose a 2% acid solution is mixed with a 3% acid solution. Find the percent of acid in each mixture. -a mixture that contains an equal amount of 2% acid solution and 3% acid solution -a mixture that contains 3 times more 2% acid solution than 3% acid

49. ## world history

How was the writting of the grito de dolores similar to the writting of the petition by the first continental congress

50. ## MATH

For a bake sale Yolanda made 3 less than 5 times as many loaves of bread as her brother, Xander. If Y is the number of loaves Yolanda made and x os the number os loaves Xander made, which equation shows this relationship? A) Y=5x-3 B)Y-3=5x C)Y=5+x-3

51. ## MATH

Look at this inequality 4m-9

52. ## Spanish

Did I conjugate these correctly? 1.tomo-tome 2.tengo-tuve 3.es-fue 4.quiero-quise 5.deseo-deseé 6.dicen-dijeron

53. ## English

Could you please check these sentences for me, please? Thank you. 1) This morning we met an American couple living in Munik. They had an eight-year-old girl and were very friendly to us. 2) Their daughter does the same ski group course as our son (also she

54. ## English

What crisis' did Marilyn Monroe have/suffer through?

55. ## math

Jeremy can type 144 words in 144 min. How many words can he type in 10 min at the same rate. Show work

56. ## Question

I'm just curious but like is 2400 is the highest score for SAT's, i know for other SAT's 800 is the highest. i think 32 is the highest for act.

57. ## Math

Kayla is 5 feet tall, and Maria is 5.5 feet tall. Kayla's shadow at 3pm outdoors measured 3feet. The length of each persons shadow is proportionate to her height. How many feet long is Maria's shadow at 3pm.

58. ## Math

Total number of scores is 45. Alex scored 9. What percent of the total number of points did Alex score?

59. ## Math

It took mike 2 2/5 hours to drive home. His sister drove same distance in 3/8 of mikes time how long did the drive take mikes sister?

60. ## Math,Ratio

a wire is bent into a rectangle.the ratio of the length of the rectangle to its breadth is 9:5.if the total length of the wire is 84cm,find the area of the rectangle formed by the wire

61. ## Algebra 2

From 1990 to 1994, the mail order sales of health products in the United States can be modeled by S = 10t 3 + 115t 2 + 25t + 2505 where S is the sales (in millions of dollars) and t is the number of years since 1990. In what year were about \$3885 million

62. ## math

Please show me how to solve: The length of a rectangle is 3 times the width. The perimeter is 44 cm. What are the dimensions of the rectangle?

63. ## math

Explain how to solve: A chemist has one solution containing 30% insecticide and another solution containing 50% insecticide. How much of each solution should the chemist mix to get 200 L of a 42% insecticide?

64. ## Maths Pri 5

The number of S's stamps is 30% of D's stamps. The number of D's stamps is 40% of B's stamps. If they have 608 stamps, how many stamps does D have? (i need a model method to answer this)

65. ## Question

Will these clubs below help me get into one of these colleges: 1. Illinois state university school of arts 2. Yale University School of Arts 3. The Illinois Institute of Art — Chicago 9th Grade Club • Epiphany (Literary Magazine) • Heart Club •

66. ## Biology

Cells absorbing sugar or other small molecules from their surroundings is an example of A. diffusion B.osmosis C. exocytosis D.endocytosis I think it is either C or D because they both have to do with the transportation of molecules in and out of cells.

67. ## Math

In division, is the quotient always greater than the numbers you started with?

hago-hice tiene-tuvo corremos-corrimos juego-jugué son-fueron juegan-jugaron piensa-pensó pienso-pensé entienden-entendieron tienen-tuvieron andan-anduvieron patinan-patinaron corren-corrieron pescan-pescaron hacen-hicieron pregunta-preguntó doy-di

69. ## physics

A particle is displaced from the point ( 4 m, 12 m ) to the point ( 9 m, 1 m ) in 30 seconds. Calculate the direction (with respect to the positive x axis) of its average velocity vector.

70. ## MATH

Juan makes \$6.50 an hour plus an extra \$15.25 per week. Last week he earned \$47.75. Look at this equation that represents Juan's earnings ;ast week. 6.50h+15.25=\$47.75 How many hours did Juan work?

71. ## Math

Jakie wants to plant 2 1/2 rows in her garden .she needs 3 1/4 ounces of seed for each row . How many total ounces of seeds should Jakie buy

72. ## Math

Jakie wants to plant 2 1/2 rows in her garden .she needs 3 1/4 ounces of seed for each row . How many total ounces of seeds should Jakie buy

73. ## Math

Jakie wants to plant 2 1/2 rows in her garden .she needs 3 1/4 ounces of seed for each row . How many total ounces of seeds should Jakie buy

74. ## Math

Jakie wants to plant 2 1/2 rows in her garden .she needs 3 1/4 ounces of seed for each row . How many total ounces of seeds should Jakie buy

75. ## Math

Put these numbers from least to greatest. -21, 60, -62, 9

76. ## chemistry help

out of the pairs of orbitals which has a higher amount of energy 4f or 6s

77. ## Social St.

How did the panama canal affect world relations

78. ## Math

How would you make 26 ft 7 ft & 360 ft into a proportion

79. ## geometry

what is value of z if the sum of 9z+9=180

80. ## physics

A ring fixed to a support at the top is hanging vertically. A bead of mass m slides through the ring and is connected to the support through a spring of stiffness k as shown in the figure-1. The length of the unstretched spring is almost negligible. Note

81. ## Trigonometry

Prove that sin(n+1)Asin(n+2)A + cos(n+1)Acos(n+2)A = cosA

82. ## English

Informal letter to shahrukh inviting him as the chief guest to a talent parade in a school (shahrukh and I are childhood friends)

83. ## ALGEBRA

Factor: 2x^2 - 5x + 2 am confused with this problem?

84. ## maths

20 mental ability questions inmaths with solutions...

85. ## math

How much would you pay for a jacket that cost \$90 if the rate of sales tax is 8%

86. ## math

How much would you pay for a jacket that cost \$90 if the rate of sales tax is 8%

87. ## English

What responsibilities did Marilyn Monroe have?