Simplify the expression. Assume that all variables represent nonnegative real numbers. y
+ 
- 4y
A. (2x - y)(2x + y)
B. (2x - y)2
C. (3x - y)2
D. (3x - y)(3x + y)
Answer: B
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Answer the question.How can the graph of f(x) = - 
be obtained from the graph of 
A. Shift it horizontally 5 units to the right. Reflect it across the x-axis. B. Shift it horizontally 5 units to the left. Reflect it across the y-axis. C. Shift it horizontally -5 units to the left. Reflect it across the x-axis. D. Shift it horizontally 5 units to the left. Reflect it across the x-axis.
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: 30 P.M B. 3:45 P.M C. 12:30 P.M D. 5:45 P.M
Determine where the function is increasing and where it is decreasing.f(x) = -x2 + 2x
A. increasing on (-?, -1) decreasing on (-1, ?) B. increasing on (1, ?) decreasing on (-?, 1) C. increasing on (-?, 1) decreasing on (1, ?) D. increasing on (-1, ?) decreasing on (-?, -1)
Name all the elements of B that belong to the given set.B = {9, 
, -7, 0, 
, - 
, 1.7, 
}Integers
A. 20, 0
B. 20, 0, 
C. 9, -7, 0, 
D. 20, -7, 0