Calculate the mean of the set of data values. If necessary, round to one more decimal place than the data values have. The retirement ages, in years, of nine employees of a software company: 
A. 57.3 yr
B. 58.0 yr
C. 56.6 yr
D. 57.9 yr
Answer: D
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Solve the system by elimination. 7x + 9y = -7-4x + 3y = 4
A. ? B. {(-1, 0)} C. {(-1, 1)} D. {(-2, 1)}
Solve.The function N(t) = 
, t ? 8gives the body concentration N(t), in parts per million, of a certain dosage of medication after time t, in hours.Graph the function on the interval [8, ?) and complete the following:N(t) ? 
as t ? ?.
A. 
N(t) ? 0.12 as t ? ?.
B. 
N(t) ? 0 as t ? ?.
C. 
N(t) ? 0.15 as t ? ?.
D. 
N(t) ? 1 as t ? ?.
Multiply the polynomials using the special product formulas. Express the answer as a single polynomial in standard form.(2x - 3)(2x + 3)
A. 4x2 + 12x - 9 B. 2x2 + 12x - 9 C. 4x2 - 9 D. 4x2 - 12x - 9
Solve.The period of vibration P for a pendulum varies directly as the square root of the length L. If the period of vibration is 4 sec when the length is 64 inches, what is the period when L = 3.0625 inches?
A. 0.875 sec B. 5 sec C. 4.75 sec D. 4.25 sec