What is the area of a circle with a diameter of 18.2 cm? use 3.14 for TT and round your final answer to the nearest hundredth.

the area is ___ square cm.​

When y’all answer can y’all explain too !

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)

What function has a range {yly< 5}? question on picture above^