Answer:
P = 12x +8
Step-by-step explanation:
The perimeter of a square is given by
P = 4s where s is the side length
P = 4(3x+2)
Distribute
P = 12x +8
It would be 1/2 pound math notebook, 3/4 history notebook, and then 7/8 science notebook
Your answer should be 724 cents, in dollars that is $7.24