I got A, -32, but it has been awhile since I have learned this in my math class. You might want to wait for someone else to verify this answer.
a= 16x+16
b= 40x + 15
Step-by-step explanation:
We know that perimeter of a rectangle is

So therefore



Answer= A) that is perimeter is 16x+16
We know that area of a rectangle is l×b
So therefore


Answer = b) that is area is 40x + 15
Dimension= width
So,
344/8= 43
The "width" or dimension, is 43.
I hope this helps!
~cupcake