Evaluate the function.f(x) = -9x + 1, f(9)
A. -82
B. 82
C. -80
D. -9
Answer: C
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Solve the initial value problem.
= sin (2x + ?), y(0) = 3
A. y = - 
cos (2x + ?) + 3
B. y = - cos (2x + ?) + 2
C. y = 2 cos (2x + ?) + 3
D. y = - 
cos (2x + ?) + 
Use identities to write each expression as a function of ?.cos (? - ?)
A. -sin ? B. -cos ? C. cos ? D. sin ?
Solve and, when appropriate, round the answer to the nearest tenth.The length L that a spring is stretched from its natural length using W amount of work (in foot-pounds) is given by L = 
, where k is a given constant for the spring. If a certain spring has a constant value k of 47.4 and the spring is to be stretched 1.6 feet from its natural length, how much work will be necessary?
A. 30 foot-pounds B. 37.9 foot-pounds C. 60.7 foot-pounds D. 121.3 foot-pounds
Perform the indicated operation.(3a2 - 5a + 6) + (9a - 5)
A. 7a2 + 1 B. 3a2 + 4a + 1 C. 3a2 + 8a + 11 D. 3a2 + 14a - 1