Simplify the expression, using only positive exponents in your answer.
A. 
B. 
C. 
D. 
Answer: D
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Estimate the answer by rounding as indicated.Estimate by first rounding to the nearest hundred.2504 ÷ 511
A. 6 B. 5 C. 3 D. 9
Divide. Express the quotient in lowest terms.
÷ 
A. 
B. 
C. 
D. 
Factor the polynomial.(x - y)2 - 20(x - y) + 100
A. (x - y - 10)(x - y + 10) B. (x - y - 100)(x - y) C. Prime D. (x - y - 10)2
Solve the problem.The amount of a certain drug in the bloodstream is modeled by the function 
, where y0 is the amount of the drug injected (in milligrams) and t is the elapsed time (in hours). Suppose that 10 milligrams are injected at 10:00 A.M. If a second injection is to be administered when there is 1 milligram of the drug present in the bloodstream, approximately when should the next dose be given? Express your answer to the nearest quarter hour.
A. 5:45 P.M B. 5: 30 P.M C. 3:45 P.M D. 12:30 P.M