Find the partial derivative.f(x, y) = x ln (9x + 4y). Find 
.
A. fx(x, y) = 
+ ln (9x + 4y)
B. fx(x, y) = 
C. fx(x, y) = ln (9x + 4y)
D. fx(x, y) = ln (9x + 4y) + 
Answer: A
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Convert to exponential notation.
A. 
B. m1/4n
C. (mn)1/4
D. mn1/4