Use the quadratic formula to solve the equation.x2 - 4x + 8 = 0

A. {2 ± 4i}
B. {2 + 2i}
C. {4, 0}
D. {2 ± 2i}

Answer: D

Mathematics

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Find the cardinal number of the indicated set. Use the cardinal number formula.If n(A) = 40, n(B) = 117 and n(A ? B) = 137, what is n(A ? B)?

A. 10 B. 60 C. 22 D. 20

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Solve the equation for the specified variable. +  =   for c

A. c = ab(a + b)
B. c = 
C. c = 
D. c = a + b

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Graph the solution set of the system of inequalities.y ?xy ? 8

A.

B.

C.

D.

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Solve for x in the given interval.sec x = - ,  ? x ? ?

A.
B.
C.
D.

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