Combine. Assume that all variables represent non-negative real numbers.3 
+ 4xy 
A. 7x2y3
B. 15x2y2
C. 15 xy2
D. 7xy3
Answer: C
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Solve the formula for the specified variable.A = 2?rh + 4?r for h
A. h = 
B. h = A - 4?r
C. h = 
D. h = A - 4?r - 2?r
Refer to the weighted voting system 
and the Banzhaf definition of power. (The four players are P1, P2, P3, and P4.)What is the weight of the coalition {P2, P3, P4}?
A. 9 B. 10 C. 12 D. 6 E. none of these
Divide.-6i ÷ (-10 + 2i)
A. 
+ 
i
B. - 
+ 
i
C. 
+ 
i
D. - 
+ 
i
Solve the problem.Assume that the sales of a certain appliance dealer are approximated by a linear function. Suppose that sales were $6500 the first year that the dealer opened and $68,500 five years after opening. Let x = 0 represent the first year. (a) Find the equation giving yearly sales y. Write your answer in slope-intercept form. (b) Use your equation from part (a) to estimate sales in the third year.
A. (a) y = 12,400x + 68,500; (b) $93,300 B. (a) y = 62,000x + 68,500; (b) $192,500 C. (a) y = 12,400x + 6500; (b) $31,300 D. (a) y = 62,000x + 6500; (b) $130,500