Multiply.3a2b9(-6a8b8 - 7b5 + 4a)
A. -18a8b8 - 21b5 + 12a
B. -18a10b17 - 7b5 + 4a
C. -18a10b17 - 21a2b14 + 12a3b9
D. -18a10b17 - 21b14 + 4a
Answer: C
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Use reduction formulas to evaluate the integral.
A. 
sec 3x tan 3x + 
ln
+ C
B. 
sec2 3x tan 3x + 
ln
+ C
C. 
sec 3x tan 3x + 
ln
+ C
D. 
sec 3x tan 3x - 
ln
+ C
Evaluate the line integral of f(x,y) along the curve C.f(x, y) = x2 + y2, C: y = -3x + 3, 0 ? x ? 3
A. 12
B. 36
C. 36
D. 216
Find the range of the given function.f(x) = x2 - 14x + 53
A. (-?, 0] B. [7, ?) C. [-7, ?) D. [4, ?)
Solve the problem.Assume that the profit generated by a product is given by 
where x is the number of units sold. If the profit keeps changing at a rate of 
per month, then how fast are the sales changing when the number of units sold is 1000? (Round your answer to the nearest dollar per month.)
A. $6325/month B. $13/month C. $316,228/month D. $12,649/month