URGENT Solve the 3-variable system using elimination. 1) -4x -5y -z = 18

2) -2x -5y - 2z = 12

3) -2x + 5y + 2z = 4

Solve to find x, y, and z.

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