Aprojectile is launched from a hole in the ground one foot deep. it’s height follows the equation h= -16^2+7t-1. use factoring by perfect-squares to find the time when the projectile lands back on the ground. (hint: landing on the ground means projectial height is zero.)

Grace is standing 18 feet from a lighthouse and kelly is standing 10 feet from grace. the angle that grace looks up to see the top of the lighthouse is 45°. the angle that kelly looks up to see the top of the lighthouse is y°. find the height, h, of the lighthouse. find the angle, rounded to the nearest tenth of a degree, in which kelly looks up to the top of the lighthouse. to the nearest tenth of a degree, find the value of x° . in two or more sentences, explain your calculations