I already know the answer I just need someone to explain step by step how to solve it. I need to know the process ​

Step-by-step explanation:

First Multiply two of the numbers, for example, 15 x 6 and then multiply that by the last number, 90 x 13 and thats your answer. Hope it helps!

Because the rectangle has four sides double both your 2x and your 3.25x +1

your equation should look like this

2x+2x+3.25x+1+3.25x+1=65

(65 is your perimeter)

combine like terms

10.5x+2=65

subtract 2 from both sides

10.5x=63

Divide both sides by your x (10.5) you are left with

x=6 thus getting your answer