Can anyone help me with this, I don’t understand what its asking

What are “like terms”? why can we only add like terms?

You have a 32-foot fence around a square garden. there are 4 equal sections. you paint 13 of one section of the fence. what fraction of the fence did you paint? you have a 32-foot fence around a square garden. there are 4 equal sections. you paint 13 of one section of the fence. what fraction of the fence did you paint?

Which of these triangle pairs can be mapped to each other using two reflections?