Austin(me) had 21 girl friends. he lost 10 in a cat fight. how many girls does he have left?

Describe the 2 algebraic methods you can use to find the zeros of the function f(t)=-16t^2+400.

Write the fraction 9/50 as a decimal if needed round to the nearest hundredth

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 =