Find the reciprocal.

A. 1
B.
C. 5
D. 0

Answer: C

Mathematics

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Find the standard equation of a parabola with the given focus or directrix. Assume that the vertex is at the origin.Directrix y = 3?

A. y2 = -12?x B. x2 = -12?y C. x2 = -3?y D. y2 = 4?x

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Mathematics

Evaluate the expression.2x2 + 4y, where x = 5 and y = -6

A. 92 B. 26 C. 76 D. -348

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Mathematics

Find dy.6y1/2 - 3xy + x = 0

A.  dx
B.  dx
C.  dx
D.  dx

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Mathematics

Find the unknown length in the right triangle. Give an exact answer and a decimal approximation rounded to three decimal places.

A. c =  km; c ? 6.000 km
B. c =  km; c = 208.0 km
C. c =  km; c ? 20.396 km
D. c = 416 km

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Mathematics