A buoy floating in the ocean is Marvin and simple harmonic motion with period 5 seconds amplitude 6ft. It’s displacement d from sea level at time t =0 seconds is 0ft, and intially it moves downward. Give the equation modeling the displacement d as a function of time t

Can someone check if i did this right since i really want to make sure it’s correct. if you do you so much

In trapezoid abcd, ac is a diagonal and ∠abc≅∠acd. find ac if the lengths of the bases bc and ad are 12m and 27m respectively.

The position of a moving particle is given by the position function: f(t)=-9t-t^2-0.2t^3+0.1t^4 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)