The length of a rectangle is three times the width. the perimeter of the rectangle is 72 feet. find the length and width of the rectangle

The zoo collects $9.60 for every 24 tickets sold. how much will be collected for 400 tickets?

How do i simply this radical expression?

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