Mai wants to make an open-top box by cutting out corners of a square piece of cardboard and folding up the sides. The cardboard is 10 centimeters by 10 centimeters. The volume in cubic centimeters of the open-
top box is a function of the side length in centimeters of the square cutouts.
Which of the following represents the volume of the box V(x).

A rectangular schoolyard is to be fenced in using the wall of the school for one side and 150 meters of fencing for the other three sides. The area in square meters of the schoolyard is a function of the length in meters of each of the sides perpendicular to the school wall.

Write an expression for .

What is the area of the schoolyard when ?

What is a reasonable domain for in this context?

care to share were the trapezoid shown is ?