Comple the similarity statement for 2 triangles shown

HELP ASAP

The triangles are similar. what is the value of x? show your work.

What is the length of the unknown leg in the right triangle ?

Is the product of two rational numbers irrational or rational? first, make a hypothesis by multiplying two rational numbers. then, use variables such as x=a/b and y=c/d and the closure property of integers to prove your hypothesis.