Answer:
The area that was not painted is 
Step-by-step explanation:
step 1
Find the area of the rectangle
we know that
The area of a rectangle is equal to

In this problem we have


substitute

step 2
Find the area that was painted

step 3
Find the area that was not painted
Subtract the area that was painted from the total area of rectangle
so

28 done by using a calculator
First you need to subtract "x" from the left side on both sides, then you have 5=x-11. then you add eleven to each side. this gives you 16=c
Answer:
b
Step-by-step explanation: