Add or subtract and write answer in lowest terms.
- 
A. 
B. 
C. 
D. 
Answer: D
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Factor any difference of two squares, or state that the polynomial is prime. Assume any variable exponents represent whole numbers.81 - 4y2
A. (9 - 2y)2 B. (9 + 2y)(9 - 2y) C. (9 + 2y)2 D. prime
Solve the equation.x2 + 6x + 9 = 12
A. ±2
B. -3 ± 2
C. -3 ± 2
D. 2
± - 3
Solve the problem.Write an iterated triple integral in the order 
for the volume of the rectangular solid in the first octant bounded by the planes 
, 
, and 
.
A. 
B. 
C. 
D. 
Solve the problem.If f(x, y) = (2000ey)/(1 + 
/2) represents the population density of a planar region on Earth, where x and y are measured in miles, find the number of people within the rectangle -6 ? x ? 6 and -3 ? y ? 0.
A. 8000(1 - e-3) ln 4 ? 10,538
B. 4000(1 - e-3) ln 
? 7904
C. 4000(1 - e-3) ln 4 ? 5269
D. 2000(1 - e-3) ln 4 ? 2635