A rectangle has a length of 15 feet less than 6 times its width. If the area of the rectangle is 561 square feet, find the length of the rectangle.
Find two positive numbers whose difference is 27 and whose product is 2680.
One number is equal to the square of another. Find the numbers if both are positive and their sum is 2450.
Write an equation in standard form that has a slope of 0 and goes through the point (5,2).