Eight more than the quotient of a number and 4 equals 5

Which shows the image of rectangle abcd after the rotation (x, y) → (–y, x)?

What is the rate of change of a line that passes through (2,-5) and (6,-2)?

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