I do not understand how to solve this problem. (Radx) + (rad 5x-16) =4

Janet drove 300 miles in 4.5 hours. write an equation to find the rate at which she was traveling

Use the formulas a = x 2 – y 2, b = 2xy, c = x 2 + y 2 to answer this question. one leg of a right triangle has length 11 and all sides are whole numbers. find the lengths of the other two sides. the other leg = a0 and the hypotenuse = a1

W-16=-12 solve each one step equation plz