Find an equation of the parabola described.Directrix the line y = 3; vertex at (0, 0)

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

Answer: D

Mathematics

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Write an expression in terms of the given variable(s) that represents the indicated quantity.The amount of money in cents in a jar containing n nickels and some dimes and some quarters if there are 3 times as many dimes as nickels and twice as many quarters as dimes.

A. 85x cents B. 175x cents C. 110x cents D. 185x cents

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Choose the most reasonable unit of measure.Circumference of a coin 68  (mm, cm, m, km)

A. km B. mm C. cm D. m

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Mathematics

Factor out the greatest common factor.21x4 - 9x3 + 12x2

A. x2(21x2 - 9x + 12) B. 3x(7x3 - 3x2 + 4x) C. 3(7x4 - 3x3 + 4x2) D. 3x2(7x2 - 3x + 4)

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Mathematics

Evaluate the expression if a = -5, b = 16, and c = 7.6b +  - 

A. 272 B. 344 C. 86 D. 82

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Mathematics