1. A
I hope this helped! This is because the division of numbers and factors are equal to this.
Answer:
$6
Step-by-step explanation:
Each foot cost $2
Hope this helped!
So, this question is basically asking us "If we had an x instead of a 2, would this be true?" We can try and see what we get:

So, if we want to show this we have to change the numerator or denominator in such a way that we can cancel some common factors. Notice that 
If we replace the factored numerator with the original one, we get:

Since we have an equality, this relation is proved.