Solve the problem.A business estimates that the salvage value V of a piece of machinery after t years is given by 
After what amount of time will the salvage value be $644?
A. After 9.6 years
B. After 10.6 years
C. After 7.6 years
D. After 8.6 years
Answer: D
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Tell whether the given rational expression is proper or improper. If improper, rewrite it as the sum of a polynomial and a proper rational expression.
A. proper
B. improper; 1 + 
C. improper; 1 - 
D. improper; -1 + 
Factor the expression. Express your answer so that only positive exponents occur. x7/4 + x5/4
A. x5/4(x1/2 - 1) B. x5/4(x1/2 + 1) C. x5/4(x1/2) D. x5/4(x1/2 + x)
There is exactly $10,000 in a trust fund that is to be invested among three types of bonds, A, B, and C, which yield 5%, 6%, and 7%, respectively, on the investment. The total yield must be at least $600, no less than $3000 may be invested in B bonds, and no more than $2000 may be invested in A bonds.If x and y represent the amounts invested in A and B bonds, then the maximum possible yield is
A. $670. B. $700. C. $600. D. $630. E. none of these
Divide.1.4 ÷ 0.04
A. 24 B. 36 C. 35 D. 3.5