Answer:
10x−31
Step-by-step explanation:
Let's simplify step-by-step.
10x+9−40
=10x+9+−40
Combine Like Terms:
=10x+9+−40
=(10x)+(9+−40)
=10x−31
Hope this helps and can you please give me brainliest ;-)
The answer would be 7y+35
Yes a square is a type of quadrilateral ( quadrilateral means 'four sides').