Solve the problem.If f(?) = cot ? and f(a) = -3, find the exact value of f(a) + f(a + ?) + f(a + 3?).

A. -9
B. -3
C. -9 + 4?
D. undefined


Answer: A

Mathematics

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Convert the given polar coordinates of the point to rectangular coordinates.

A.
B.
C.
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Give two parametric representations for the equation of the parabola.y = x2 + 4x + 12

A. x = t, y = t2 + 4t + 12 for t in (-?, ?); x = t + 2, y = t2 + 8 for t in (-?, ?) B. x = t, y = t2 - 4t - 12 for t in (-?, ?); x = t + 2, y = t2 + 8 for t in (-?, ?) C. x = t, y = t2 + 4t + 12 for t in (-?, ?); x = t - 2, y = t2 + 8 for t in (-?, ?) D. x = t, y = t2 + 4t + 12 for t in (-?, ?); x = t - 2, y = t2 - 8 for t in (-?, ?)

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Find the surface area of the geometric solid. If needed, use 3.14 as an approximation for ? and round the answer to the nearest tenth.Cube: s = 9 ft

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