Find the derivative of y.y = ln(sech (9x + 6))

A. tanh (9x + 6)
B. -tanh (9x + 6)
C.
D. -9 tanh (9x + 6)

Answer: D

Mathematics

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Find the indicated composition.f(x) = 4x2 + 3x + 4; g(x) = 3x - 5Find (g ? f)(x).

A. (g ? f)(x) = 4x2 + 9x + 7 B. (g ? f)(x) = 4x2 + 3x - 1 C. (g ? f)(x) = 12x2 + 9x + 7 D. (g ? f)(x) = 12x2 + 9x + 17

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Perform the indicated operation. Simplify the result. - 

A.
B.
C.
D.

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Solve.x2 + 16x + 62 ? 0

A. (-?, -8 -  ) ? (-8 + , ?)
B. (-?, -8 - ] ? [-8 + , ?)
C. (-?, -] ? [, ?)
D. [-8 -  , -8 +  ]

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Replace the ? with < or >.0.39 ? 0.38

A. = B. > C. <

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Mathematics