School start tomorrow . just number 3

The equation x2 – 1x – 90 = 0 has solutions {a, b}. what is a + b?

Closing a credit card usually _your debt ratio.a. increasesb. decreasesc. improvesd. has no effect on

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 =