The other x-intercept is:
(1/2, 0) OR (.5, 0)
V of rectangular prism = l * w * h = 12 * 2 * 312 = 7,488 in³
V of one cube with side lengths 12 = l * w * h = 12 * 12 * 12 = 1,728 in³
Divide the volume of rectangular prism by the volume of the cube.
7488 / 1728 = 13 / 3 or 4.3. . .
5x2 would be 10 and 10-50x would be negative 40x and 40x + 125 would be 165x
Write that as 7x. Writing it as x7 could lead to confusion. 7*x would be OK.