Find the axis of symmetry of the given function.f(x) = -2x2 + 7x + 3
A. x = 
B. x = - 
C. x = 
D. x = - 
Answer: A
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Find the volume of the described solid.The base of a solid is the region between the curve y = 6cos 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. 3?
C. 
?
D. 9?
Find the limit.
sec2 x - tan2 y + z
A. 8 B. 7 C. 9 D. 10
Solve.The distance to the horizon (in miles) of a satellite h miles above Earth's surface is given by the expression 
. What is the distance to the horizon from a satellite that is 25 miles above Earth? Express the answer in radical form.
A. 20
mi
B. 250
mi
C. 25
mi
D. 10 mi
Use the sum/difference identities to simplify the expression. Do not use a calculator.cos 
cos 
- sin 
sin 
A. 
B. 
C. 1
D. 