1. 4x^{2}=81 2. (4x−3)^{2}+7=39

3. 2x^{2}−2=6

4. 13x^{2}−3=4209

5. 10(x−7)^{2}=440

Solve each equation by square roots

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 =

Given: klmn is a parallelogram m? n=3m? k, lf ? kn , ld ? nm kf=2 cm, fn=4 cm find: lf, ld

Ihave like no idea how to do any of this !