PLEASE HELP ME FOR 30 POINTS

Which expression will have the same sum as 3_8 + 1/4?

The center of the circumscribed circle lies on line segment and the longest side of the triangle is equal to the of the circle.

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)