The perimeter of a rectangle is 230 feet. the short sides are each 30 feet long, but the lengths of the long sides are unknown. which equation represents this situation?
30+2a=230
2(30)+2a=230
2(30)a=230
30a=230

For this case we have that by definition, the perimeter of a rectangle is given by:

Where:

a: It is the length of the rectangle

b: It is the width of the rectangle

We have as data that:

Then, replacing we have:

Option B

the correct answer is the last option