Solve the problem.If the derivative of an even function f(x) is zero at x = c, can anything be said about the value of 
Give reasons for your answer.
What will be an ideal response?
Yes. The value of f 'at x = -c must also be zero since even functions are symmetrical with respect to the y-axis.
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Simplify. If an expression does not represent a real number, state this.
A. 19 B. -7 C. ±7 D. 49
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 ? ?.
Solve the problem.The sales tax on a freezer is $9.41 and the sales tax rate is 6%. Find the purchase price (the price before taxes are added) and the total price paid. Round your answers to the nearest cent.
A. $156.83, $166.24 B. $134.43, $143.84 C. $15.68, $25.09 D. $188.20, $197.61
Solve the triangle with the given parts.? = 28.2°, ? = 28.3°, a = 15.9
A. ? = 123.5°, b = 28.1, c = 16.0 B. ? = 123.5°, b = 16.0, c = 28.1 C. ? = 124.5°, b = 28.1, c = 16.0 D. ? = 124.5°, b = 16.0, c = 28.1