Please answer my question

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.

Measure of angles 31 (x+4) (3x+9) me

The difference of three and the reciprocal of a number is equal to the quotient of 20 and the number. find the number.