9. The sum of four consecutive numbers in an A. P. is 28. The product of the
second and third numbers exceeds that of the first and last by 18. Find the
numbers.
The fourth term of an A. P. is 1 and the sum of the first 8 terms is 24 Find the

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 =