Perform the indicated operation and write your answer with positive integer exponents.
A. n + m
B. -n - m
C. -n + m
D. n - m
Answer: A
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Determine if the given set of whole numbers is closed under multiplication.{1, 2, 3, 4, . . . }
A. Closed B. Not closed
Add or subtract. Assume all variables represent positive real numbers.
- 6
- 4
A. -47
B. -47
C. -10
D. -10
The table shows, for some particular year, a listing of several income levels and, for each level, the proportion of the population in the level and the probability that a person in that level bought a new car during the year. Given that one of the people who bought a new car during that year is randomly selected, find the probability that that person was in the indicated income category. Round your answer to the nearest hundredth. 
$40,000 - $49,999
A. 0.25 B. 0.21 C. 0.17 D. 0.22
Find the volume under the surface z = f(x,y) and above the rectangle with the given boundaries.z = (x + y)2; -1 ? x ? 1, -1 ? y ? 1
A. 
B. 
C. 
D. 