Answer & Step-by-step explanation:
These are easy, just substitute the value for the variable as they say it is and solve :)
I will get you started with the first one, and then you can do the last three on your own. We will substitute the value for l and w into the correct spots in the formula.
P = 2(2.5) + 2(1.25)
P = 5 + 3.5
P = 8.5
I'm always happy to help :)