Solve the problem.If f(?) = cos ? and f(a) = - 
, find the exact value of f(a) + f(a - 2?) + f(a + 4?).
A. - 
B. - 
C. -36
D. -12
Answer: A
Mathematics
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÷ 2
A. 2
B. 1
C. 1
D. 1
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Solve the problem.A collection of dimes is arranged in a triangular array, with 15 coins in the base row, 14 in the next, 13 in the next, and so forth. Find the value of the collection.
A. $1.20 B. $12.00 C. $24.00 D. $6.00
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Solve the system of equations using matrices.2x - 7y = -19-5x + 4y = 7
A. (-1, -3) B. (1, -3) C. (1, 3) D. (-1, 3)
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Use the discriminant to decide whether the equation represents a parabola, an ellipse, or a hyperbola.4x2 - 9xy - 5y2 + 15 = 0
A. Parabola B. Ellipse C. Hyperbola
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