We know that 
.
Solve using cross multiplication of the last two fractions. I will use 
to represent the width of the rectangle. 
Multiply. 
Divide both sides of the equation by 
. 
Answer:
Step-by-step explanation:
this seems like substitution
If so its the first part is 12x6
second part is 35 x 6
third part is 56 x 6
No - a proportional relationship would be of the form y = kx or y = k/x where k is some constant.
a. (2x + 6) - 4 represents how to find the area of the table cloth. (to be honest, I'm not sure why you have to subtract the lace, or what I'm assuming is the lace...)
b. 2x + 6 represents how to find the area of the table cloth.
c. 2x represents the x length getting multiplied by 2, since there are 2 sides.
I hope this helps just a little bit though. I'm sorry I could get part a very well.
