What is the range of f(x) = (three-fourths) superscript x – 4?
{y | y > –4}
left-brace y vertical line y greater-than three-fourths right-brace
{y | y < –4}
left-brace y vertical line y less-than three-fourths right-brace

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.