With this, i don't know is my numbers are right.

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.

I’m still confused on how to work the percentages

Olga bought a new skirt that cost $20. sales tax is 5%. how much did olga pay, including sales tax? 7.