Jeffrey used to be on the phone 3 1/2 times as much as his sister. his parents were angry and told him they would take his his phone away is he did not reduce his time spent on the phone. he cut down to 2/5 of the time he used to be on the phone. how many times as much as his sister is jeffrey on the phone now?

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