Find the real solutions, if any, of the equation. Use the quadratic formula.x2 + 7x + 7 = 0
A. 
B. 
C. 
D. 
Answer: D
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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 as t ? ?.
B. 
N(t) ? 1 as t ? ?.
C. 
N(t) ? 0.1 as t ? ?.
D. 
N(t) ? 0.125 as t ? ?.
Determine whether the relation is a function.A store's "Employee of the Month" for various months:
A. Not a function B. A function
Simplify. Assume radicands of square roots are positive.(
)3
A. 
B. 3x2
C. 27x6
D. 9x2
Solve the problem.A study was conducted to compare the average time spent in the lab each week versus course grade for computer students. The results are recorded in the table below. Use the equation of the least squares line to predict the grade of a student who spends 14 hours in the lab. Number of hours spent in lab (x) Grade (percent) (y) 10 96 11 51 16 62 9 58 7 89 15 81 16 46 10 51
A. 65.4% B. 62.6% C. 58.6% D. 74.6%