38/6 converted to a mixed number

Which expression is equivalent to (3^2)^-2 a.-81 b.-12 c.1/81 d.1/12

Which of the following answers is 7/9 simplified? 7/9 2/9 11/9 2/7

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.