Use the half-angle formulas to simplify the given expression.

A.  cos 3x
B. cos 3x
C. 2 cos 3x
D.  sin 3x

Answer: C

Mathematics

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Find the GCD or LCM as indicated.Given 30 and 90, find the LCM.

A. 270 B. 180 C. 90 D. 30

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Solve the equation. +  = 4

A. 2, -2
B. , -2
C. -2
D. 0

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Mathematics

Approximate f(x) to four decimal places.f(x) = -3.4e-2.9x, x = 1.6

A. -0.0328 B. 0.0328 C. -352.0508 D. 352.0508

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Mathematics

Perform the indicated computation. Write the answer in scientific notation.

A. 5 × 1021 B. 36 × 1020 C. 5 × 1020 D. 36 × 1021

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Mathematics