Answer: 
Step-by-step explanation:
This is a rectangle missing a piece which looks like a triangle.
Find the area of the rectangle and subtract the area of the triangle.
Rectangle:

Triangle:

Now subtract the area of the triangle from the area of the rectangle.

Answer:
4+8=12 so,if its 12 so
Step-by-step explanation:
the some will be 12
12-8=4
12-4=8
Answer:
1. 13
2. 28
Step-by-step explanation:
hope this helps
Answer:
a. x - 2y = 4
Step-by-step explanation:
carry on learning