Need help with Khan Academy quickly due in 5 hours.

Determine the volume of a cylinder bucket if the diameter is 8.5 in. and the height is 11.5 in.

How many triangles can be drawn with side lengths 4 centimeters, 4.5 centimeters, and 9 centimeters? explain

After t seconds, a ball tossed in the air from the ground level reaches a height of h feet given by the equation h = 144t-16t^2. after how many seconds will the ball hit the ground before rebounding?