The short side lengths of a rectangle are t and the longer lengths of the rectangle are t+3. write two equivalent expressions for the perimeter of the rectangle.
plz !

Perimeter is all the lengths of the sides added together, that is, t+(t+3)+t+(t+3).

For the second equation, I’m guess you simplify the first:
Without the brackets, t+(t+3)+t+(t+3) = t+t+t+t+3+3 = 4t+3+3
Simplify = 4t+6

Therefore, first equation = t+(t+3)+t+(t+3), second equation = 4t+6

Maybe the answer is 20mm. all i really did was just multiply, which is obvious.