We've use the formula for the volume of a box a few times in class. Now we're going to derive it. Use a double integral to find the formula for a box. Integrate over (a, b] in a and (c, d) in y. Let the box have a height h, a length of I and width of w. Hint: What f(x, y) would you use? What equation would you use to represent the top of a box of height h