calculus
posted by rachel .
The side of a square is measured to be 12 inches with a possible error of ±0.02 inch in that measurement. If x is the exact length of the side of the square, express this difference as an absolute value inequality and solve. Then find the interval expressing the range of possible true areas of the square when using the measured length of 12 inches for a side.

11.98 < x < 12.02
It could be 12.02 *12.02 for example, or 11.98*11.98