Write the function in the form y = f(u) and u = g(x). Then find dy/dx as a function of x.y = (-3x + 9)5
A. y = u5; u = -3x + 9; 
= -3(-3x + 9)5
B. y = u5; u = -3x + 9; 
= 5(-3x + 9)4
C. y = u5; u = -3x + 9; 
= -15(-3x + 9)4
D. y = 5u + 9; u = x5; 
= -15x4
Answer: C
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