Solve the problem.If f(x, y) = (3000ey)/(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 -7 ? x ? 7 and -2 ? y ? 0.
A. 6000(1 - e-2) ln 4 ? 11,399
B. 3000(1 - e-2) ln 
? 3902
C. 12,000(1 - e-2) ln 
? 15,606
D. 6000(1 - e-2) ln 
? 7803
Answer: C
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Match the system with the appropriate graph.A system with solution (4, 7)
A. 
B. 
C. 
D. 
Fill in the blank with one of the words or phrases listed below.
The addends of an algebraic expression are called the 
of the expression.
A. algebraic expression B. like C. terms D. variable
Solve the problem.Suppose the cost per ton, y, to build an oil platform of x thousand tons is approximated by 
What is the cost per ton for x = 300?
A. $300.91 B. $225.12 C. $150.00 D. $214.29
Factor completely. If the polynomial cannot be factored, write "prime."250k3m - 16m4
A. 2m(5k - 2m)(25k2 + 10km + 4m2) B. 2m(125k - 2m)(k2 + 10km + 4m2) C. (10km - 4m2)(25k2 + 4m2) D. 2m(5k + 2m2)(25k2 - 10km + 4km2)