Solve the problem.Find the centroid of the infinite region in the first quadrant bounded by the coordinate axes and the curve 
.
A. 
= 
, 
= 
B. 
= 
, 
= 
C. 
= 
, 
= 
D. 
= 
, 
= 
Answer: C
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Evaluate the integral.
ln 7x dx
A. 15.47 B. 15.26 C. 17.82 D. -4.11
Factor completely.20x2 + 31x + 12
A. (20x + 1)(x + 12) B. (4x - 3)(5x - 4) C. (4x + 3)(5x + 4) D. (20x + 3)(x + 4)
Solve the problem.In September 1998 the population of the country of West Goma, in millions was modeled by 
At the same time the population of East Goma, in millions was modeled by 
In both formulas x is the year, where 
corresponds to September 1998. Assuming these trends continue, estimate what the population will be when the populations are equal.
A. 16 million B. 17 million C. 1 million D. 18 million
Estimate an answer to the problem.An advertisement states that television sets are on sale at B&G Electronics. The sale prices are: 
set, $147.99; 
set, $208.95; 
set, $231.99; 27-inch set, $289.97; 
set, $519.97. Estimate the approximate number of 
style="vertical-align: -4.0px;" /> sets that can be bought for $6278. A. 30 B. 25 C. 40 D. 300