# Rachal

Popular questions and responses by Rachal
1. ## Trig

How can I find the exact value of Sin 480 degrees? Thanks

2. ## Algebra

Miguel is choosing between two exercise routines. In Routine #1, he does only running, burning 15 calories per minute. In Routine #2, he burns 12 calories walking. He then runs at a rate that burns 12 calories per minute. For what amounts of time spent

3. ## Algebra

Owners of a recreation area are filling a small pond with water. They are adding water at a rate of 25 liters per minute. There are 700 liters in the pond to start. Let W represent the amount of water in the pond (in liters), and let T represent the number

4. ## Algebra

Below is the graph of a polynomial function f with real coefficients. Use the graph to answer the following questions about f. All local extrema of f are shown in the graph. I really need help with this one but I can't post the graph.

5. ## Algebra

Boyle's Law says that the volume of a gas varies inversely with the pressure. When the volume of a certain gas is 4L, the pressure is 165 kPa(kilopascals). What is the volume when the pressure is 60 kPa?

6. ## Algebra

Find the equation of the quadratic function f whose graph is shown below. Ponts on the graph are (-3,-1)(-2,-4) f(x)=

7. ## Algebra

Miguel is choosing between two exercise routines. In Routine #1, he does only running, burning 15 calories per minute. In Routine #2, he burns 12 calories walking. He then runs at a rate that burns 12 calories per minute. For what amounts of time spent

8. ## Algebra

A 3 inch thick slice is cut off the top of a cube, resulting in a rectangular box that has volume 128in^3 .Round your answer to two decimal places

9. ## Trig

Use a cofunction to write an expression equal to csc(4ð/11). I need help solving this problem. Thank You

10. ## Math

A department store is holding a drawing to give free shopping sprees to two lucky customers. There are 15 customers who have entered the drawing: 4 live in the town of Gaston, 6 live in Pike, and 5 live in Wells. In the drawing, the first customer will be

11. ## Algebra- is my answer right

Choose the end behavior of the graph of each polynomial function. A f(x)= -5x^3-4x^2+8x+5 B f(x)= -4x^6+6x^4-6x^3-2x^2 C f(x)= 2x(x-1)^2(x+3) A= falls to the left and rises to the right B= Falls to the left and right C=Rises to the right and left.

12. ## Trig

Find all solutions of the equation in the interval [0,2pi). sqrt(3)cottheta-1= 0 Write your answer in radians in terms of pi. If there is more than one solution, separate them with commas.

13. ## Algebra

The number of bacteria in a certain population increases according to an exponential growth model, with a growth rate of 11% per hour. An initial sample is obtained from this population, and after four hours, the sample has grown to 4130 bacteria. Find the

14. ## Algebra

Austin is going to rent a truck for one day. There are two companies he can choose from, and they have the following prices. Company A charges \$104.00 and allows unlimited mileage. Company B has an initial fee of \$65.00 and charges an additional \$.60 for

15. ## pre-algebra-is my answer right

Rewrite the expression without using a negative exponent. 4z^-4 Simplify your answer as much as possible. is this right? (1/4z^4)

16. ## Physics

Boyle's Law says that the volume of a gas varies inversely with the pressure. When the volume of a certain gas is 4L , the pressure is 165kPa (kilopascals). What is the volume when the pressure is 60kPa?

17. ## Trig

Find all solutions of the equation in the interval [0,2pi) . cos(theta)=0.7125 If there is more than one solution, separate them with commas. Do not round any intermediate computations, and round your answer(s) to the nearest hundredth. Can someone help me

18. ## Math

You can answer any 8 questions from the 12 questions on an exam. In how many different ways can you choose the 8 questions, assuming that the order in which you choose the questions is irrelevant?

19. ## Math

Suppose that 34% of the people who inquire about investments at a certain brokerage firm end up investing in stocks, 30% end up investing in bonds, and 35% end up investing in stocks or bonds (or both). What is the probability that a person who inquires

Use a cofunction to write an expression equal to csc(4ð/11). Is the answer csc(4ð/11)= 1/sin(4ð/11)

21. ## Algebra-I'm still stuck

The one-to-one function f is defined by f(x)=(4x-1)/(x+7). Find f^-1, the inverse of f. Then, give the domain and range of f^-1 using interval notation. f^-1(x)= Domain (f^-1)= Range (f^-1)= Any help is greatly appreciated. Algebra - helper, Wednesday,

22. ## Algebra- is my answer right

Charlie is going to rent a truck for one day. There are two companies he can choose from, and they have the following prices. Company A charges \$127 and allows unlimited mileage. Company B has an initial fee of \$55.00 and charges an additional \$0.90 for

23. ## Algebra

Find a polynomial f(x) of degree 3 with real coefficients and the following zeros. -1,3+i f(x)=

24. ## Math ratio word problem

The ratio of horseshoes to shamrocks was 11 to 5, and two times the number of shamrocks was 12 less than the number of horseshoes. How many were shamrocks? thank you :)

25. ## Math 10

Cashew nuts are sold at 15 per kg. Walnuts are sold at 12 per kg. What quantities of each nut would a store owner put into a 100-kg barrel so that it could be sold for 13.20 per kg?

Find the reference angle for -144 degrees. I'm coming up with 504 degrees, but I think I'm missing a step.

27. ## Statistics- I'm stuck and its due tonight

In a particular hospital, 6 newborn babies were delivered yesterday. Here are their weights (in ounces): 112, 96, 109, 126, 99, 106 Assuming that these weights constitute an entire population, find the standard deviation of the population. Round your

28. ## Algebra- I get 1 out of two parts

Owners of a recreation area are filling a small pond with water. They are adding water at a rate of 25 liters per minute. There are 700 liters in the pond to start. Let W represent the amount of water in the pond (in liters), and let T represent the number

29. ## Algebra- is my answer right

The one-to-one function f is defined by f(x)=(4x-1)/(x+7). Find f^-1, the inverse of f. Then, give the domain and range of f^-1 using interval notation. f^-1(x)= Domain (f^-1)= Range (f^-1)= Any help is greatly appreciated. Algebra - helper, Wednesday,

30. ## Algebra

Ok I got another one I can figure out The one-to-one function f is defined by f(x)=(4x-1)/(x+7). Find f^-1, the inverse of f. Then, give the domain and range of f^-1 using interval notation. f^-1(x)= Domain (f^-1)= Range (f^-1)= Any help is greatly

31. ## Algebra

Multiply. x-(6+2i)][x-(6-2i)] Note that these expressions contain complex numbers. Simplify your answer as much as possible.

32. ## Math

The following is a list of 11 measurements: -2,82,87,-1,-51,-2,53,87,-20,32,35 Suppose that these 11 measurements are respectively labeled. x1,x2¡¦¡¦¡¦¡¦¡¦x11.(Thus,-2 is labeled x1,82 is labeled x2 and so on.) find ¢²_(i=1)^11¢Æx1/49 Round

33. ## Math

Charlie is going to rent a truck for one day. There are two companies he can choose from, and they have the following prices. Company A charges \$127 and allows unlimited mileage. Company B has an initial fee of \$55.00 and charges an additional \$0.90 for

35. ## Algebra

The function h is defined by h(x) . 6+x/4+2x Find h(2x)

36. ## Algebra

The function h is defined by h(x) . 6+x/4+2x Find h(2x)

37. ## Math

Frank has a 65% chance of receiving an A grade in geology, a 60% chance of receiving an A grade in mathematics, and a 77% chance of receiving an A grade in geology or mathematics (or both). Find the probability that he receives A grades in both geology and

38. ## Algebra

Find all complex solutions of 4x^2+5x+2=0.

39. ## Math

Solve for x. 14^(-3x)=11^(-x-3) Write the exact answer using base-10 logarithms How do I start this problem? Thank You

40. ## Algebra

I don't even know where to start, teacher gave us this with no direction. Suppose the polynomial R(x)=a9x^9+a8x^8+...+a,x+a0 has real coefficients with a9 cannot equal 0. Suppose also that R(x)has the following zeros: 5, 6, 5+5i. Using this information,

41. ## Algebra

To rent a certain banquet hall, there is a reservation fee of \$4200.00 and an additional fee of \$180.00 per hour. The Russell family wants to spend at most \$5100.00 on renting the hall. What are the possible amounts of time for which they could rent the

Find the unit vector in the direction of . Do not approximate any numbers in your answer. I get (-1/sqrt10) and (-3/sqrt10)

43. ## Math

Solve for x. log3(x+7)=2-log3(x-1) Write the exact answer using base-10 logarithms.

44. ## Statistics - can someone check me

Frank has a 65% chance of receiving an A grade in geology, a 60% chance of receiving an A grade in mathematics, and a 77% chance of receiving an A grade in geology or mathematics (or both). Find the probability that he receives A grades in both geology and

45. ## Math-word problem

To rent a certain banquet hall, there is a reservation fee of \$4200.00 and an additional fee of \$180.00 per hour. The Russell family wants to spend at most \$5100.00 on renting the hall. What are the possible amounts of time for which they could rent the

46. ## Math

Suppose that the number of bacteria in a certain population increases according to an exponential growth model. A sample of 2600 bacteria selected from this population reached the size of 2873 bacteria in two and a half hours. Find the continuous growth

47. ## Statistics-desperate

I don't know how to post some of the question is there a way I can upload it?

48. ## beginning algebra

The length of a rectangle is 1ft more than twice its width, and the area of the rectangle is 28ft^2 . Find the dimensions of the rectangle. l= w=

49. ## Trig

A ramp 38' long rises to a platform. The bottom of the platform is 20' from the foot of the ramp. Find x , the angle of elevation of the ramp. Round your answer to the nearest hundredth of a degree. After this question I'm done with TRIG!!! Thanks

50. ## intermediate algebra-can somebody check my answer

Evaluate the expression m^2+93+7 when m=-4 -4^2+9*(-4)+7 does it = -13

51. ## Algebra

The polynomial function is defined by f(x)=4x^4+2x^3-8x^-5x+2. Use a calculator to find all the points (x,f(x)) where there is a local maximum. Round to the nearest hundredth.

52. ## Trig

I need help, I don't remember what to do. Find all solutions of the equation in the interval [0,2pi]. (2cosè+sqrt3)(cscè+1)=0 Write your answer in radians in terms of pi. If there is more than one solution, separate them with commas.

53. ## Math

Can anybody help me start this? Thanks

54. ## intermediate algebra

Write the equation of the line: The points are at (-8,-6) and (0,0). The line passing through these two points has a y-intercept of 0 since it passes through the origin. The slope is -6-0/-8-0=3/4 How would I finish this? Thanks

55. ## Trig

I need help solving the two problems below. Thanks For each equation, determine whether its graph is symmetric with respect to the -axis, the -axis, and the origin. Check all symmetries that apply. 1. y=-ã(4-x^(2)) 2. 34x^(2)+12y^(2)=18

56. ## math- check me

Solve the inequality for x. 16 =3 Is that right?

57. ## Physics

In an electrical circuit, the current passing through a conductor varies inversely with the resistance. Suppose that when the current is 8A (amperes), the resistance is 15 ohms. What is the current when the resistance is 4 ohms?

58. ## beginning algebra

In an electrical circuit, the current passing through a conductor varies inversely with the resistance. Suppose that when the current is 8A (amperes), the resistance is 15 ohms. What is the current when the resistance is 4 ohms?

59. ## Algebra

Graph the equations y=2|x-5|+2

60. ## Math

The polynomial function f is defined by f(x)x^4-3x^3-2x^2+4x+5. Use a graphing calculator to find all the points (x,f(x)) where there is a local maximum. Round to the nearest hundredth

61. ## Algebra

The function g is defined below. g(x)=((x)^(2)-9x+14)/((x)^2-11x+24) Find all values of x that are NOT in the domain of g. If there is more than one value, separate them with commas.

62. ## Algebra

The function h is is defined below. h(x)=48x^2+ 12x - 16 Find all values of x that are NOT in the domain of h. If there is more than one value, separate them with commas. I'm lost.

63. ## Trig

I need help solving the two problems below. Thanks For each equation, determine whether its graph is symmetric with respect to the -axis, the -axis, and the origin. Check all symmetries that apply. 1. y=-sqrt(4-x^(2)) 2. 34x^(2)+12y^(2)=18

64. ## math- check me

f(x)=3 -4|-11+x| -4|-11+3| -4|8| Do I divide or multiply?

65. ## Math

Evaluate the following: |6-10|-|5| I get: |-4|-|5| 4-5 Is the answer -1

66. ## beginning algebra

Factor: -8w+uw+vu-8v

67. ## Algebra- is my answer right

Solve the following inequality. (x-4)/(-x+2)>0 Write your answer using interval notation. x4 Thanks

68. ## beginning algebra-check my answer

[(x^2-1)/(x-3)] / [(x^2-x-2)/(3x-9)] I get (3x-3/x-2)

69. ## Algebra

The polynomial function f is defined by f(x)x^4-3x^3-2x^2+4x+5. Use a graphing calculator to find all the points (x,f(x)) where there is a local maximum. Round to the nearest hundredth.

70. ## intermediate algebra

Write the equation of the graph. Points are (-8,-6) and (0,0). I think you start at rise over run. But I'm confused thanks

71. ## Trig

The polynomial function f(x) is defined by f(x)=-4x^4+9x^3+2x^2-7x-2. Use a graphing calculator to find all the points where there is a local minimum. Round to the nearest hundredth.

1. ## Algebra

Thanks!

posted on June 8, 2011
2. ## Algebra

The function h is is defined below h(x)=(x+6)/(x^2+9x+8) Find all values of x that are NOT in the domain of h. If there is more than one value, separate them with commas.

posted on May 18, 2011
3. ## Trig

thanks!

posted on May 14, 2011

I now think its 36 degrees

posted on May 14, 2011
5. ## Trig

Thanks!!!!

posted on May 14, 2011
6. ## Trig

thats supposed to be a neg in front of the 4 in problem 1.

posted on May 13, 2011
7. ## Trig

Thank you I see where I got stuck

posted on May 13, 2011
8. ## Math

I got: 2873 = 2600 e^(2.5r) ln(2873 / 2600) = 2.5r [ln(2873 / 2600)] / 2.5 = r r=0.0399381 it says to round the percentage to the nearest hundreth. any help

posted on February 21, 2011
9. ## Math

I got 2/21 thanks for the input

posted on February 21, 2011
10. ## Math

I figured it out. Equation: time + time = 60 hrs. --- x/30 + (1425-x)/15 = 60 --- x + 2*1425- 2x = 30*60 --- -x = -1050 x = 1050mL --- x/30 = 35 hrs (time of 1st storm) ----- (1425-x)/15 = 375/15 = 25 hr (time of 2nd storm)

posted on February 15, 2011
11. ## Math

Thank You

posted on February 15, 2011
12. ## Math

I get this but i can't remember what else I do The "AND" are is shared. This is the key. Abandoning the lengthy names: A + S = 0.34 ==> S = 0.34 - A A + B = 0.30 ==> B = 0.30 - A S + B - A = 0.35

posted on February 10, 2011
13. ## Statistics-desperate

Its impossible I have alrady tried and it inserts funky symbols

posted on February 9, 2011
14. ## pre-algebra-is my answer right

thank you

posted on February 9, 2011
15. ## Physics

E=IR E=15*8 E=120V -------------- I=E/R I=120/4 I=30 amperes

posted on February 9, 2011
16. ## Math

I get add -2,82,87,-1,-51,-2,53,87,-20,32,35=300 300/49=6.12244 Round two decimals = .061244 or 61.22? I don't know which way I should go.

posted on February 8, 2011
17. ## beginning algebra

Well this is a question within the subject I posted. Sorry for not labeling it right

posted on February 8, 2011
18. ## Algebra- is my answer right

if the answer should be m

posted on February 5, 2011
19. ## Math

a=127 b=55+.9m 127=55+.9m 72=.9m m=80

posted on February 5, 2011
20. ## Algebra

Thanks

posted on February 3, 2011
21. ## Algebra- is my answer right

Got it thanks

posted on February 3, 2011
22. ## Algebra-I'm still stuck

I want to thank all of you for taking the time to help me understand the problem

posted on February 3, 2011
23. ## Algebra

I don't know if this is right but this is what I came up with. f^-1=(-7x+1)/(x-4) domain f(^-1)=(-inf,-7)U(-7,inf) range f(^-1)=(-inf,4)U(4,inf) Let me know if it looks right. Thanks

posted on February 2, 2011
24. ## Algebra

I don't understand what else do I need to do?

posted on January 25, 2011
25. ## Math-word problem

I got Let t = number of hours hall is rented then 180t + 4200

posted on January 24, 2011
26. ## Algebra

thanks

posted on January 23, 2011