How to calculate percent error?

Subtract the accepted value from the experimental value.

Take the absolute value of step 1.

Divide that answer by the accepted value.

Multiply that answer by 100 and add the % symbol to express the answer as a percentage.

By definition, the perimeter of a rectangle is given by:

Where,

w: width of the rectangle

l: length of the rectangle

We write then the inequality that represents the problem:

Rewriting we have:

Then, solving the inequality for "l" we have:

Therefore, the length must be at least 38 feet.

An inequality that represents all possible values for the length of the deck is:

The possible values for the length of the deck is:

[38, inf)