Maximizing the Area of a rectangle. Drag the locators to vary the width of the rectangle and see the effect on its area. For a rectangle with a perimeter of 40, the height is always 20 minus the width. This allows you to reduce the formula for the area. I hope this helps you
Speed=distance/time
Speed=7.5/3
Speed=2.5 mph
The n-th term is given by

Then we can find the common ratio from the given terms.

The appropriate choice is -1.