State if the two triangles are congruent. if they are state how you know

What is the y intercept of f(x)=(1/2)^x?

Could someone with number 1 and 2

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.