Hello i would really appreciate it if you help!

Is δ pmr similar to δ smn ? if so, which postulate or theorem proves these two triangles are similar?

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

Aclothing store has the sign shown in the shop window. pani sees the sign and wants to buy 3 shirts and 2 pairs of jeans. the cost of each shirt before the discount is $12, and the cost of each pair of jeans is $19 before the discount. write and simplify an expression to find the amount pani pays if a $3 discount is applied to her total