Which system of equations does not have a real solution? y = x 2 + 3x - 5 and x + y = -10 y = x 2 + 3x - 5 and 4x + 5y = 20 y = x 2+ 3x- 5 and x + y = -9

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