Suppose u and v are differentiable functions of x. Use the given values of the functions and their derivatives to find the value of the indicated derivative.u(2) = 7, u '(2) = 2, v(2) = -1, v '(2) = -4.
(2u - 4v) at x = 2
A. 18
B. -12
C. 20
D. 10
Answer: C
Mathematics
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?
A. 
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D. ?
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