Given f(x) = -3x + 21, find x when f(x) = 6.

Question 5 spring semester final exam math evaluate

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 =

Is (root2 -2)^2 rational or irrational. show the steps and answer fast