The length of a rectangle is 3 inches more than its width. if the perimeter is 42 inches, find the dimensions of the rectangle. show how you got your answer?

42-6=36
36 divided by 4= 9
By this point there are 9 inches on each side.
Take one nine and add three
Do this twice
So the problem should look like this
3+3=6 42-6=36 36 divided by 4= 9 9+3=12 9+3=12
Perimeter = 12+12+9+9=42

A) for the n row: 22+(n-1)×6therefore,b) 100-22=78that means (n-1)×6=7878÷6=1313+1=1414th row has 100 seats