Question 845174
Since you already know the formula for the perimeter which is 

P = 2L + 2W, you simply plug in the values into the formula and you will find the perimeter.

So, when L = 15 and W = 25 we can write this:

P = 2(15) + 2(25)

P = 30 + 50

P = 80

Therefore the perimeter is 80.