Hello!
5/5 in simplest form equals 1
5 divided by 5 is 1
Left one is linear and the one on the right is nonlinear
In this question, it is given that the diagonal of the board is 18 inches long and one side of the board is 12 inches long.
Let the other side is of length b inches .
Now we use pythagorean identity, which is

Here, a = 12 and c=18
Substituting these values, we will get

And the formula of perimeter is

Substituting the values of the two legs, we will get

60.
Because 60x0.40 is 24