PLEASE HELP QUICK!! A hockey player stands 30 ft from the goal. If he shoots the puck at an angle of elevation of 15 degree and it hits the top of the goal post, how high is the goal post? Round to the nearest tenth

The position of a moving particle is given by the position function: f(t)=-9t-t^2-0.2t^3+0.1t^4 0 a. at what time does the particle reverse direction? b. when is the displacement positive? (round one decimal place and answer in interval notation) c. when is the displacement negative? (round one decimal place and answer in interval notation) d. when is the particle’s acceleration positive? (round one decimal place and answer in interval notation) e. when is the particle’s acceleration negative? (round one decimal place and answer in interval notation)