Find the missing side lengths​

Solve the equation x/4 - 5= -8 -27 -12 -7 12

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.

Which number completes the inequality? 2/3 < _ < 7/9