A Rocket is launched from the top of an 30 foot cliff with an initial velocity of 160 feet per second. The height, h of the rocket after t seconds is given by the equation h=16t2+160t+30.how long after the rocket is launched will it be 20 feet from the ground

Girardo is using the model below to solve the equation . girardo uses the following steps: step 1 add 4 negative x-tiles to both sides step 2 add 1 negative unit tile to both sides step 3 the solution is which step could be adjusted so that gerardo's final step results in a positive x-value? in step 1, he should have added 4 positive x-tiles to both sides. in step 1, he should have added 3 negative x-tiles to both sides. in step 2, he should have added 4 negative unit tiles to both sides. in step 2, he should have added 1 positive unit tile to both sides.