Yours supposed to find the missing length I have the answer I just need the work for it!!! Please and thank youuu

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

Y= a(x-3)squared-1 what is the value of a

Is the ordered pair (-10, 7) a solution to the equation y = 17 – x? yes or no