Solve the problem.An object is propelled vertically upward from the top of a 288-foot building. The quadratic function 
models the ball's height above the ground, 
in feet, t seconds after it was thrown. After how many seconds does the object reach its maximum height? Round to the nearest tenth of a second if necessary.
A. 2 sec
B. 7 sec
C. 15.2 sec
D. 1.2 sec
Answer: B
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In the problem, sin ? and cos ? are given. Find the exact value of the indicated trigonometric function.sin ? = 
, cos ? = 
Find tan ?.
A. 
B. 
C. 
D. 
Simplify. Write your answers in the form of a+bi, where a and b are real numbers.(7 + 3i)2
A. 58 - 42i B. 40 - 42i C. 40 + 42i D. 58 + 42i
Solve.In 1998, the population of Country C was 40 million, and the exponential growth rate was 1% per year. Find the exponential growth function.
A. P(t) = 400.01t , where P(t) is in millions and t is the number of years after 1998. B. P(t) = 40e0.01t, where P(t) is in millions and t is the number of years after 1998. C. P(t) = 40e0.01, where P(t) is in millions and t is the number of years after 1998. D. P(t) = 40e10t, where P(t) is in millions and t is the number of years after 1998.
Simplify.6 + (-7) - (-17)
A. -18 B. 16 C. -4 D. -16