Solve the problem.Which of the following are symmetries of the letter Z?
A. a reflection with axis a vertical line
B. a 180° rotation
C. a reflection with axis a horizontal line
D. a reflection with axis a diagonal line
E. none of these
Answer: B
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Solve the problem.In a chemical reaction, the rate at which the amount of a reactant changes with time is proportional to the amount present, such that 
, when t is measured in hours. If there are 
of reactant present when t = 0, how many grams will be left after 
? Give your answer to the nearest tenth of a gram.
A. 0.1 g B. 3.9 g C. 1.9 g D. 5.8 g
Give a rule for the piecewise-defined function. Then give the domain and range.
A. f(x) = 
; Domain: (-?, 0) ? {5}, Range: (-?, ?)
B. f(x) = 
; Domain: (-?, ?), Range: (-?, 0] ? {5}
C. f(x) = 
; Domain: (-?, ?), Range: (-?, 0) ? {5}
D. f(x) = 
; Domain: (-?, 0] ? (5), Range: (-?, ?)
Add or subtract.(-5mn + 3mn2 - 3m2n2) + 
A. 3m2n2 + 5m2n + 3mn2 - 11mn B. 1mn + 3mn2 + 5m2n + 3m2n2 C. 0m2n2 D. -11mn + 8m2n + 3m2n2
Find all points where the function is discontinuous.
A. x = 0, x = 1 B. x = 0 C. x = 1 D. None