You earn 0.85 for every cup of hot chocolate you sell how many cups do you need to sell to earn 55.25

With alll of except for the 2 that i did already

Can anyone me with this question?

A) find the derivative of the inverse to f(x) = 3x + sint at x 6. b) (cale) find the derivative of the inverse to f(x)+3sin at x 6. if x +2y -34, ind he behaviar of the cure at 4,.3), c) a. increasing, concave up d. decreasing, concave down b. increasing, concave down e. decreasing, inflection point c. decreasing, concave up