Use a sum-to-product identity to rewrite the expression.sin (7t + 8) + sin (2t + 4)

A. 2cos  cos 
B. 2cos  sin 
C. 2sin  cos 
D. 2sin  sin 

Answer: C

Mathematics

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Find the gradient field of the function.f(x, y, z) = 5

A. ?f = 54i + j + 5k
B. ?f = i + j - 5k
C. ?f = 54i + j - 5k
D. ?f = 54i + j + 5k

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Mathematics

Graph the equation.0.25x + 0.40y = 2

A.

B.

C.

D.

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Mathematics

Find the limit.

A.
B. 3
C. -?
D.

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Mathematics

Solve the rational inequality and graph the solution set on a real number line.  ? 2

A. [-2, -1)

B. (-?, -1) ? [0, ?)

C. (-?, -2] ? (-1, ?)

D. (-1, 2]

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Mathematics