Posted by meme on Wednesday, March 21, 2012 at 9:51am.
If y varies directly as x^2 and y=20 when x=4, find y when x=7?

college Algebra  Henry, Thursday, March 22, 2012 at 6:19pm
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, Saturday, March 24, 2012 at 10:23pm
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, Saturday, March 24, 2012 at 10:24pm
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?
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