The perimeter of a rectangular countertop is 20 feet. It is 7 feet long. How wide is it?

It is 3 feet wide

Step-by-step explanation:

perimeter is the boundary of a closed geometric figure aka total of all sides

rectangle guarantees opposite sides are equal

multiply both lengths 7*2=14

Subtract the two lengths from the perimeter 20-14=6

Divide the two widths by 2 to get one 6/2=3

more detail

step-by-step explanation:

u = -(6/7)w

step-by-step explanation:

place all values with 'u' on one side of the equation.

4u + 8w = - 3u + 2w

4u + 3u = 2w - 8w

further simplify the equation by solving the addition and subtraction.

7u = - 6w

make 'u' the independent variable by placing its co-efficient on the right-hand side.

u = - (6/7)w