Posts by Rachal

Total # Posts: 97

  1. 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?
  2. Algebra

    Thanks!
  3. 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.
  4. 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?
  5. 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?
  6. 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 running will Routine #1 ...
  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 running will Routine #1 ...
  8. 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 every mile driven. For...
  9. Algebra restate problem

    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.
  10. 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.
  11. 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.
  12. Algebra

    Find a polynomial f(x) of degree 3 with real coefficients and the following zeros. -1,3+i f(x)=
  13. 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
  14. 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.
  15. 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 with this? Thanks
  16. 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.
  17. Trig

    thanks!
  18. 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.
  19. Trig- Check my answer Please

    Find the unit vector in the direction of <-1,-2>. Do not approximate any numbers in your answer. I get (-1/sqrt10) and (-3/sqrt10)
  20. Trig- Check my answer Please

    I now think its 36 degrees
  21. Trig- Check my answer Please

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

    Thanks!!!!
  23. 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
  24. Trig

    thats supposed to be a neg in front of the 4 in problem 1.
  25. 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
  26. Trig

    Thank you I see where I got stuck
  27. Trig

    How can I find the exact value of Sin 480 degrees? Thanks
  28. 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 of minutes that ...
  29. 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 of minutes that ...
  30. Trig- Check my answer Please

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

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

    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
  33. 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 rate per hour. Write ...
  34. Math

    I got 2/21 thanks for the input
  35. 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 selected at random, ...
  36. 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
  37. Math

    Solve for x. log3(x+7)=2-log3(x-1) Write the exact answer using base-10 logarithms.
  38. 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)
  39. Math

    Can anybody help me start this? Thanks
  40. math- check me

    f(x)=3 -4|-11+x| -4|-11+3| -4|8| Do I divide or multiply?
  41. math- check me

    Solve the inequality for x. 16 <= 4x+4 I get x>=3 Is that right?
  42. Math

    Thank You
  43. Math

    Evaluate the following: |6-10|-|5| I get: |-4|-|5| 4-5 Is the answer -1
  44. 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
  45. 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
  46. 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
  47. 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 answer to at least two ...
  48. 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 mathematics. I get: ...
  49. 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 mathematics. P(geo ...
  50. 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?
  51. 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
  52. 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 about investments at ...
  53. Statistics-desperate

    Its impossible I have alrady tried and it inserts funky symbols
  54. Statistics-desperate

    I don't know how to post some of the question is there a way I can upload it?
  55. 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=
  56. pre-algebra-is my answer right

    thank you
  57. 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)
  58. Physics-my answer

    E=IR E=15*8 E=120V -------------- I=E/R I=120/4 I=30 amperes
  59. 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?
  60. 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.
  61. 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.) ...
  62. beginning algebra

    Well this is a question within the subject I posted. Sorry for not labeling it right
  63. 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?
  64. beginning algebra

    Factor: -8w+uw+vu-8v
  65. beginning algebra-check my answer

    [(x^2-1)/(x-3)] / [(x^2-x-2)/(3x-9)] I get (3x-3/x-2)
  66. can anyone clarify

    if the answer should be m<=80 I don't have an equal answer option. Thanks
  67. 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 every mile driven. For ...
  68. my answer-please check me

    a=127 b=55+.9m 127=55+.9m 72=.9m m=80
  69. 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 every mile driven. For ...
  70. 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
  71. 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.
  72. 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, answer the ...
  73. Algebra

    Thanks
  74. 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 number of bacteria ...
  75. Algebra- is my answer right

    Got it thanks
  76. 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.
  77. Algebra

    Find all complex solutions of 4x^2+5x+2=0.
  78. Algebra-I'm still stuck

    I want to thank all of you for taking the time to help me understand the problem
  79. 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, February 2, 2011 at 7:...
  80. 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, February 2, 2011 at 7:...
  81. 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
  82. 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 appreciated.
  83. Algebra- is my answer right

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

    Graph the equations y=2|x-5|+2
  85. Algebra

    I don't understand what else do I need to do?
  86. 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)=
  87. 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
  88. 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.
  89. Math-word problem

    I got Let t = number of hours hall is rented then 180t + 4200 <= 5100 . Solving for t: 180t <= 900 t <= 5 hours
  90. 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 hall? Use t for the ...
  91. Algebra

    Solve for v. v+6/5=3/5v-7/3 Simplify your answer as much as possible. This answer cannot be a radical. Thanks
  92. 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 hall? Use t for the ...
  93. Algebra

    thanks
  94. Algebra

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

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

    Multiply. x-(6+2i)][x-(6-2i)] Note that these expressions contain complex numbers. Simplify your answer as much as possible.
  97. 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 :)