I need help on this ASAP

For the equations below which statement is true ?

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

Sections of prefabricated woods are each 5 1/3 feet long, how long are 7 1/2 sections placed end to end?