# Questions Asked onDecember 30, 2010

1. ## calculus

the side of a cube is expanding at a constant rate of 2 centimeters per sesond. what is the instantaneous rate of change of the surface area of the cube, in cm2 per second, when its volume is 27 cubic cm

2. ## geometry

The perimeter of an isosceles triangle is 42 cm . its base is 2/3 times the sum of the equal sides . find the length of each side and the area of the triangle.

3. ## precal

are there solutions to x^3+27i=0 is so what are they?

4. ## math (combination)

A woman has 11 close Friend. Find the number of ways she can invite 5 of them to dinner if a. but where 2 of the friends are married and will not attend separately b. where 2 of the friend will not attend together the answer to a. 210 b. 252 Please

5. ## Geometry

Find the surface area of a right octagonal pyramid with height 2.5 yards, and its base has apothem length 1.5 yards.

6. ## related rates calculus problem

A balloon is being filled with air at a rate of 3 cubic meters per minute. Find the rate at which the radius is changing when the volume is 113.0973355 cubic meters.

7. ## physics

A railroad car of mass 2500 kg moving at 5.00 m/s collides and couples with two coupled railroad cars, each of the same mass as the single car and moving in the same direction at 2.20 m/s. (a) What is the speed of the three coupled cars after the

8. ## Math (combination/permutation)

Question 1: There are 12 students in a class. Find the number of ways that 12 studenets can take 3 different tests if 4 students are to take each test. Question 2 Find the number of ways 12 students can be partitioned into 3 teams A, B, C, so that each

9. ## Chemistry

Which of the following is an example of a physical change ? A) Zinc metal is added to hydrochloric acid and a gas is released. B) Concentrated hydrochloric acid is diluted with water. C) Acid rain causes the decomposition of a marble statue. D)

10. ## math-calculus

A spy tracks a rocket through a telescope to determine its velocity. The rocket is traveling vertically from a launching pad located 10 km away. At a certain moment, the spy's instruments show that the angle between the telescope and the ground is equal to

At the instant when the radius of a cone is 3 inches, the volume of the cone is increasing at the rate of 9 pi or 28.27433388 cubic inches per minute. If the height is always 3 times the radius, find the rate of change of the radius at that instant?

12. ## physics

A 107.0 N grocery cart is pushed 14.0 m along an aisle by a shopper who exerts a constant horizontal force of 40.0 N. If all frictional forces are neglected and the cart starts from rest, what is the grocery cart's final speed?

13. ## physics

A 107.0 N grocery cart is pushed 14.0 m along an aisle by a shopper who exerts a constant horizontal force of 40.0 N. If all frictional forces are neglected and the cart starts from rest, what is the grocery cart's final speed?

14. ## math

Find the equation of an ellipse with minor axis length 8 and vertices at (-9,3),(7,3)

15. ## calculus

At the instant when the radius of a cone is 3 inches, the volume of the cone is increasing at the rate of 28.27433388 cubic inches per minute. If the height is always 3 times the radius, find the rate of change of the radius at that instant?

16. ## Math (combination/permutation)

Question 1: There are 12 students in a class. Find the number of ways that 12 studenets can take 3 different tests if 4 students are to take each test. Question 2 Find the number of ways 12 students can be partitioned into 3 teams A, B, C, so that each

17. ## science

What is a way to put alloy and concentration into a sentence that helps to explain solutions?

18. ## math

what is 7-2i in trig form? and if u=3j and v=7i+j what is the dot product of u times v don't get this one because there are no i terms for u thanks

19. ## math

whats the vertex of 4y^2+4y-16x+13=0?

20. ## related rates problem-calculus

A spherical balloon is being filled with air in such a way that its radius is increasing at a rate of 2 centimeters per second. At what rate is the volume of the balloon changing at the instant when its surface has an area of 4 pi square centimeters?

21. ## related rates problems

Water pours out of a conical tank of height 10 feet and radius 4 feet at a rate of 10 cubic feet per minute. How fast is the water level changing when it is 5 feet high?

22. ## math

Find the equation of an ellipse with minor axis length 8 and vertices at (-9,3),(7,3) is this right so far? (X+1)^2/not sure +(y-3)^2/64=1

23. ## physics

A boy on roller blades throws a jug of water away from himself, giving it a speed of 10 m/s. The boy's mass is 50 kg and the mass of the jug and water is 9 kg. What is the velocity gained by the boy?

24. ## com170

I would like to know if i am on the right track I am to write five sentence about the role of education in a successful financial planning.I am to highlight the verb and put the tense in parentheses. Here goes Education plays a major role in successful

25. ## English

Thank you for suggesting me a website on audiobooks. Here are some sentences I'm not sure of. 1) Dr. Frankenstein can be seen as Rousseau's primitive man, detached from society and unspoilt by civilization. 2)He can also be seen as the dark side of

26. ## math

there are 9 students who wear glassses. of the students who waer glassesor contact lenses,what percent are glasses

27. ## help on calculus

A spherical balloon is being filled with air in such a way that its radius is increasing at a rate of 2 centimeters per second. At what rate is the volume of the balloon changing at the instant when its surface has an area of 4 pi or 12.56637061 square

What are the biggest obstacles faced by a brick and mortar company that wishes to establish an eCommerce website?

29. ## physics

explain examples of physical laws used during the Apollo 13 mission to get it home

30. ## precal help

Find a Parabola with Vertex (3,1) Focus (4,1) Find the vertex of 4y^2+4y-16x+13=0 Find the center of an ellipse 9x^2+4y^2-36x-24y-36=0 Find an ellipse with minor axis of 8 and vertices at (-9,3),(7,3)

31. ## math

you invest 200.00 into a savings account that earns 2% simple interest. How long will it tkae to earn 50.00 in interest?

32. ## Diversity

Young children are more likely to demonstrate early literacy skills when a. they are read to on a regular basis. b. they watch tv for over an hour c. they see their parents reading or watching tv d. they play video games on computer i chose "c" they see

33. ## To Susie

I've deleted your post. Keep in mind that Jiskha ... ... has no affiliation with any particular school or other institution, and ... doesn't have exams or answers.

34. ## percents

at anthoney's school,25% of the 72 sixth grade students wearv either glasses or contact lences.

35. ## math

A helicopter is 400 miles directly north of Ghana and is flying at 20 miles per hour. A second helicopter is 300 miles east of Ghana and is flying west at 15 mph. What is the rate of change of the distance between the helicopters?

36. ## com170

I would like to know if I did this assignment right write five sentences with the verb highlighed and the tense in parentheses Education "plays"(present tense) a major role in successful financial planning.You will "need"(future tense) to take a financial

37. ## Algerbra

Suppose your profit for one day is \$1,565, and the cost of running the business for the day is \$1,230. What is the revenue for that day? What is the formula to find the answer?

38. ## Sci Plzz See This Post

Does my poem below have these things "explain why it is where it is on the periodic table, what element(s) it might combine with to make a compound/molecule, and finally, WHY it would interact with that other element" Here is the Poem Below: “What’s

39. ## math

log [ a^3\/ab / (ab^2) ] --> in words this is, log(a to the power 3 times by the square root of ab divided by (a times b to the power of two) please show the full steps

40. ## math

what is a cylinder

41. ## Math

Suppose there is a 10 meter ladder leaning against the wall of a building and the base of the ladder is sliding away from the building at a rate of 3 meters per second. How fast is the top of the ladder sliding down the wall when the base of the ladder is

42. ## Calculus

A baseball player hits a line drive to center field. He runs from second to third at 20 feet/sec. How fast is the distance from the runner to home plate changing when he is halfway to third base?

43. ## chemistry

If 300.0g of NaN3 (Sodium Azide) is combined with 300.0g Pb(CH3O2)2 (Lead acetate) which compound runs out first?

44. ## trigonometry

tan60=2 tan30/1-tan^2 30 sqrt(3)=I'm confused of that 2 but i guess it means to multiply. again.. sqrt(3)= (2) sqrt(3)/3 / 1- sqrt(3)/2 ^2 now i don't know how to square tan . if u can show me in details i would appreciate it. this is just a practice

45. ## Garland High school

Suppose you must maintain a balance of least \$500 in your checking account in order to have free checking. The current balance in your checking account is \$635.27. Which inequality describes how much can write a check for a and still have free checking? A.

46. ## english

Hi i am in college and I want to be ESL teacher the only thing that hinders me from reaching my goal is that i am not native english speaker. Please tell me a ways to improve my english, suggest me books that i could buy,ways to learn how to write poems,

What is the best way to tell a chemical change has taken place? 1. The matter changes color 2. The mixture separates into layers 3. The composition chnages

crystal agreed to serve on a company's advisory board and now has to contact them to say she cannot attend a scheduled meeting where she was to be one of the several key speakers. what should she do? a. Let the company knows she cannot attend and that they

49. ## science

What is a way to put alloy and concentration into a sentence that helps to explain solutions?

10 x-10

51. ## English 1

Through changing his facial expression indicates he may find a particular sound soothing or comforting.

52. ## Sci

Does my poem below have these things "explain why it is where it is on the periodic table, what element(s) it might combine with to make a compound/molecule, and finally, WHY it would interact with that other element" Here is the Poem Below: “What’s

53. ## English (Shifting and mixed sentences)

1. By showing babies plain, black-and-white images will help them learn to recognize shapes and focus their vision. 2. Babies can see their parents’ faces but will not respond with a smile until they are a few weeks old. 3. Babies may gaze intently into

54. ## English

I forgot to include the following sentences. I really hope you can have a look at them too. 1) The main features of Wordsworth's poetry are as follows. As for the subject, poetry should deal with everyday situations and with people living in the

55. ## physics

3 stings are attached on a ring. 2 of the strings make 70 degrees angle and each is pulled with 7.0 N . What force must be applied to keep the 3rd string to keep stationary?

56. ## Math

The factors of x^3 -4x^2 -x+4 are? How do I solve this?

57. ## physics

A 3.35 kg ball moving at 4.20 m/s to the right hits a 2.45 kg ball head-on that is traveling at 3.50 m/s to the left. The second ball ends up going to the right with a velocity of 5.50 m/s. What is the velocity of the first ball after the collision?

58. ## Alg. 2

How to find the domain of the inverse function of x^2-10x+25

59. ## math

if you buy every item in the song The Twelve Days of Christmas, how many items will you buy?

60. ## Math

What is the rule for this input output tabel? Input Output 5 12 8 24 11 36 14 48

61. ## CHILD CARE

i need help with my lesson plan, my concept to be taught is more than ABC can u help me please

62. ## calculus

what is the equation for taking the derivitive of -x^2+x just equation setup i don't need an answer from power rool

63. ## chemistry

At what temperature will 85 grams sdium nitrate dissolve in 100 grams H2O? Is it 17 degrees celcius? thank you so much!

64. ## physical

violence in sports

65. ## chemistry

Properties of light energy

66. ## Math

log8(768 x 16) --> the 8 is a subscript to log --> please show steps.

67. ## English

How would a 3rd grader classify this sentence using s, scs and scv? And where can I learn how to teach this better to my 3rd grader. Read your library book quietly at your desk. Thanks

68. ## Sci Question????

Can you please explain the structure of the element "Flourine"?

69. ## Chemistry

Can you please explain the structure of the element "Flourine"?

70. ## Math.

If 11 inches on a map represents a distance of 64 miles, what distance does 5 inches represent?

71. ## english

is the story the fools of gatham is a folktale or a realsthic fiction

72. ## chemistry

If you had walked into the lab, only to discover that you only had 0.1 M sulfuric acid available to run your tests, how might this have affected your calculations? Why?

73. ## Calculus

Can someone give a detailed solution to this integration problem? âˆ« dx /(3(1 - x^2 ) - (5 + 4x)âˆš(1 - x^2)) this symbol âˆš is square root The answer is ( I need the steps and/or u-substitution used to arrive at this answer ) (2âˆš(1 +

74. ## English

Thank you very much for your corrections. Here are the last sentences of the day. 1) According to Wordsworth, the subject matter of poetry should (?) concern everyday people living in the countryside. 2)The story begins in the middle of the Arctic ices,