Find the exact value of the expression if ? = 30°. Do not use a calculator.f(?) = cos ?Find [f(?)]2.
A. 
B. 
C. 
D. 
Answer: A
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Identify the property illustrated by the statement.9 + (-9) = 0
A. Addition property B. Additive identity C. Multiplicative identity D. Inverse property of addition
Find the volume of the described solid.The base of a solid is the region between the curve y = 3cos x and the x-axis from x = 0 to x = ?/2. The cross sections perpendicular to the x-axis are isosceles right triangles with one leg on the base of the solid.
A. 
?
B. 
?
C. 
?
D. 2?
For the piecewise function, find the specified function value.f(x) = {
f(-7)
A. 21 B. 64 C. -62 D. -49
Determine the slope and the y-intercept. Then graph the equation.x + y = 4
A. m = 1; y-intercept: (0, -4)
B. m = 1; y-intercept: (0, 4)
C. m = -1; y-intercept: (0, -4)
D. m = -1; y-intercept: (0, 4)