Can someone PLS help me I need to pass!

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

Write 17/20 as a decimal and as a percent.

1- what do you think the product of a nonzero rational number and an irrational number is? is it rational or irrational? make use of variables, the closure property of integers, and possibly a proof by contradiction to prove your hypothesis.2- why do we have to specify that the rational number must be nonzero when we determine what the product of a nonzero rational number and an irrational number is? if the rational number were 0, would it give us the same result we found in the first question?