Factor the binomial completely.x4 - 81
A. (x2 - 9)(x2 - 9)
B. (x2 + 9)(x2 + 9)
C. (x2 + 9)(x + 3)(x - 3)
D. prime
Answer: C
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Find the volume of the described solid.The solid lies between planes perpendicular to the x-axis at 
and 
. The cross sections perpendicular to the x-axis between these planes are squares whose bases run from the semicircle 
to the semicircle 
.
A. 
B. 
C. 
D. 
Find the determinant of the given matrix.
A. 36 B. 72 C. 144 D. 9
The graph of a function f(x) is sketched below. Which of the following is f(x)?
A. f(x) = 
- 2
B. f(x) = 
+ 2
C. f(x) = x2 - 5x - 2
D. f(x) = 
Solve the problem.The demand function for a certain product is given by 
where p is price per unit. Recall that total revenue is given by R(p) = pD(p). At what price per unit p will the revenue be maximum?
A. $5 B. $10 C. $9 D. $20