If x = 5, what additional information is necessary to show that by SAS?

What’s the domain of this function? fast

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.

Find the domain and range of the following function f(x) = 51x - 21+ 4