Answer:
Step-by-step explanation:
I suppose the expression is this 
We can factor out this expression ( Remember, find two numbers that the sum is 9 and the product is 8. The numbers are 8 and 1)

The perimeter is just all the lines around the outside of the shape so basically take all the numbers and add them together to get the answer
The Original Price is $40
Explanation:
50 1 20
—- = — Which means ——
100 2 40
To solve this, do 8 division 6, the answer should be 1.3333...
if you convert that to a fraction, it should be 1 1/3