Write out the sum.
A. 
+ 
+ 
+ ... + 
B. 1 + 2 + 3 + ... + n
C. 5 + 40 + 135 + ... + 
D. 
Answer: A
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Solve the problem.Find the center of mass of the lamina in the first quadrant bounded by the coordinate axes and the curve 
if 
.
A. 
= 
, 
= 
B. 
= 
, 
= 
C. 
= 
, 
= 
D. 
= 
, 
= 
Use scientific notation to perform the computation. Leave the answer in scientific notation.
A. -3.0 × 10-2 B. 3.0 × 10-2 C. -3.0 × 102 D. 3.0 × 102
Find the indicated cross product.v = 4i - 6j + k, w = 2i - 4j - kFind w × v.
A. 4i + 10j - 10k B. 6i + 10j + 4k C. 10i + 6j + 16k D. -10i - 6j + 4k
Solve the problem.In Country X, the average hourly wage in dollars from 1960 to 2010 can be modeled by f(x) = 
Use f to estimate the average hourly wages in 1965, 1985, and 2005.
A. $0.77, $2.27, $6.67 B. $0.77, $3.05, $6.67 C. $3.43, $0.39, $6.67