\begin{aligned} & 5x-9y\geq8 & 7x-4y < 10 \end{aligned} 5x−9y≥8 7x−4y< 10 is (2,2)(2,2)left parenthesis, 2, comma, 2, right parenthesis a solution of the system?

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