Frank has constructed a tent in the shape of a square pyramid. The peak of the tent is at 30 feet and is at a horizontal distance of 20 feet from the left edge. The height of the tent varies at a rate of 1.5 feet with the horizontal distance from the left edge.

The equation that models the height of the tent, h, in feet, with respect to the horizontal distance in feet from the edge, d, is h= *blank*|d-*blank*|+*blank*. The height of the tent is 22.5 feet at a horizontal distance of *blank* feet from its left edge. ​