Evaluate. Assume u > 0 when ln u appears. 
A. 15 ln (e7x + 1) + C
B. (e7x + 1)-2 + C
C. ln (e7x + 1) + C
D. ln (e7x + 1) + C
Answer: C
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Find a Cartesian equation for the line whose polar equation is given.r cos = 4
A. y = 8 - x
B. y = x + 4
C. y = 8 - x
D. y = 4 - x
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Solve the problem.Ellen sells $540 worth of clothes and earns $32.40 in commission. What is her commission rate?
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