college Algebra
posted by meme .
If y varies directly as x^2 and y=20 when x=4, find y when x=7?

college Algebra 
Henry
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 
Rose
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 
Rose
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
Similar Questions

algebra1
M varies directly with n; m=144 when n=8. What is the constant of variation k? 
Variation
I have few questions that I need checked please and could you help me with the last question? 
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 … 
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. … 
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! 
college algebra
Solve each variation problem. n varies directly as q, and n= 39 when q=3. Find n when q=8. 
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 
math
t varies directly as the square root of l. If l=81, then t=10 what is the constant proportion? 
PreCalc
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 … 
PreAlgebra
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 …