Multiply mentally.(5x4 - 4)2
A. 25x16 - 40x4 + 16
B. 25x8 - 20x4 + 16
C. 25x8 - 40x4 + 16
D. 25x8 + 16
Answer: C
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Solve the problem.If x dollars is deposited every four weeks (13 times a year) into an account paying an annual interest rate r, expressed in decimal form, then the amount An in the account after n years can be approximated by the formula 
If 
is deposited every four weeks into an account paying 
interest, approximate the amount in the account after 24 years.
A. $54,938.30 B. $22,461.11 C. -$6395.55 D. $1098.77
Find the sum.Find the sum of the first 30 terms of the arithmetic sequence: -9, -19, -29, -39, . . .
A. -4770 B. -4620 C. -4612 D. -309
Find the average value of 
over the given region.
over the cube in the first octant bounded by the coordinate planes and the planes 
, 
, 
A. 
B. 9
C. 
D. 
Match the surface show below to the graph of its level curves.
A. 
B. 
C. 
D. 