Post a New Question

college Algebra

posted by .

If y varies directly as x^2 and y=20 when x=4, find y when x=7?

  • college Algebra -

    Y = kx^2 = 20. x = 4.
    k*4^2 = 20.
    16k = 20. k = 20/16 = 5/4.

    Y = kx^2.
    Y = (5/4)*7^2 = 61 1/4 = 61.25.

  • COLLEGE ALGEBRA -

    An investment of $63,000 was made by a business club. The investment was split into three parts and lasted one year. The first part of the investment earned 8% interest, the second 6% and the third 9%. Total interest from the investments was $4950. The interest from the investment was 4 times the interest from the second. Find totals of the three parts of the investment. What is the amount of the first part of the investment?

  • college Algebra -

    A hardware supplier manufactures three kinds of clamps, type A, B, and C. Production restrictions force it to make 20 more type C clamps than the total of the other types and twice as many as B clamps as type A clamps. The shop must produce 380 clamps per day. How many of each type are made per day? How many type A clamps are produced?

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. algebra1

    M varies directly with n; m=144 when n=8. What is the constant of variation k?
  2. Variation

    I have few questions that I need checked please and could you help me with the last question?
  3. Algebra II

    1. If y varies directly as x, and y=30 when x=4, find the constant of proportionality. 2. If y varies inversely as x, and y=2 when x=10, find x when y=4. 3. If a varies jointly as b and c, and a=-10, when b=12 and c=2, find a when …
  4. Math

    DIRECT VARIATION 1. a is directly proportional to b.If a=15,then b=9 2. m varies directly as n.If n=2/3,then m=1/4 3. T varies as the square root of L. If L=81,then T=10 4.r varies directly as the square of t. If t=16,then r=6. 5. …
  5. Math

    This is regarding direct variation. y varies directly as the square of R. If y = 128 when R = 8, find y when R = 5. Another one I cannot figure out: If x varies directly as y, and x = 32 when y = 8, find x when y = 10 Help!
  6. college algebra

    Solve each variation problem. n varies directly as q, and n= 39 when q=3. Find n when q=8.
  7. College Algebra

    y varies directly as the third power x and inversely as Z. If y=16 when x=4 and z=8,find y when x=9 and z=6
  8. math

    t varies directly as the square root of l. If l=81, then t=10 what is the constant proportion?
  9. Pre-Calc

    1.) Suppose that y varies directly as x. If y is 5 when x is 30, the constant of variation is 150. True Or False 2.) If w varies directly as z and w = 9 when z = -6, find w when z = 3. 3.) If y varies directly as x and y = 2 when x …
  10. Pre-Algebra

    If y varies directly with x, find the constant of variation with x = 4 and y = -24 If y varies inversely with x, find the constant of variation with x=5 and y = 10 If y varies directly with x, and y = 35 when x = 5 , find x when y …

More Similar Questions

Post a New Question