Aright triangle abc is shown below:

a right triangle abc with height ab labeled 4 units and base bc labeled 5 units is shown.

the area of the triangle above will equal one half of a rectangle that is 5 units long and __ units wide. (input only whole numbers, such as 8.)

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)