Which expression can be used to find the volume of the cylinder in this composite figure? A cylinder and cone. Both have a radius of 4 centimeters. The cone has a height of 8 centimeters and the cylinder has a height of 7 centimeters. V = B h = pi (4) squared (7) V = B h = pi (7) squared (4) V = B h = pi (4) squared (8) V = B h = pi (8) squared (7)

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)