1. the circumference of a circle with diameter of 8 feet is 2. the circumference of a circle with a diameter of 13 centimeters is 3. the circumference of a circle with a radius of 3.5 miles is

Aball is thrown from a height of 139 feet with an initial downward velocity of 15 ft/s. the ball's height h (in feet) after t seconds is given by the following. h=139-15t-16t^2 how long after the ball is thrown does it hit the ground? round your answer(s) to the nearest hundredth. (if there is more than one answer, use the "or" button.) t =