Solve the problem.Which of the pairs of numbers whose sum is 80 has the largest product?
A. 40 and 40
B. 39 and 41
C. 38 and 42
D. 30 and 50
Answer: A
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Solve.An electronics manufacturer's revenue R for selling x mobile phones is given by 
A competing electronics manufacturer's revenue for selling a similar mobile phone is 
Under what circumstances will both manufacturers make the same revenue?
A. They will make the same revenue if they sell 0 or 220 phones. B. They will make the same revenue if they sell 880 phones. C. They will make the same revenue if they sell 0 or 880 phones. D. They will never make the same revenue.
Use Cramer's rule to solve the linear system. If D = 0, use another method to determine the solution set.2x + 2y + z = 152x - 3y - z = 43x + y + 4z = 28
A. {(3, 1, 5)} B. Cramer's rule does not apply since D = 0; ? C. {(5, 1, 3)} D. {(5, 3, 1)}
Multiply. Simplify, if necessary.- 
? 
A. - 
B. 
C. 
D. - 
Find the zeros of f(x), given that one zero is k.f(x) = 9x4 - 6x3 + 9x2 + 6x - 18
k = -1
A. -1, 
± 
i
B. -1, -1 ± 
C. ±1, 1 ± 
D. ±1, 
± 
i