Solve the system by elimination.

A. (18, -4)
B. (-4, 18)
C. (4, -18)
D. (6, -18)

Answer: B

Mathematics

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A. (a) ; (b) 
B. (a) ; (b) 
C. (a) 1; (b) 1
D. (a) ; (b) 

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Solve the problem.If the average cost per unit C(x) to produce x units of plywood is given by C(x) = , what is the unit cost for 20 units?

A. $25.00 B. $75.00 C. $1.50 D. $21.43

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Find the real or imaginary solutions by using the quadratic formula.x2 - 8x + 20 = 0

A. {-4 ± 2i} B. {4 ± 2i} C. {6, 2} D. {8 ± 4i}

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Perform the indicated operations and simplify the result. Leave the answer in factored form. + 

A.
B.
C.
D.

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