Which ordered pair is a solution to the system of equations? note: use the substitution method. {x=1/4y+2 {−4x+3y=4 (7/2, 6 ) (−1/4, 1 ) (−11/2, −26/3 ) (5/4, 3 )

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