A retirangle has an area of 40 units. the lenght is 6 units greater then the width

First think of all the combinations that equal 40

1x40

2x20

5x8

10x4

But since the length is 6 units greater than the width 10x4 would be what you have to work with since 10 is 6 more than 4. The length would be 10 and the width would be 4.

40 units multiply by 6 units equal 240 units