A rational number times a rational number=rational numberan irrational number times a rational number=irrational number remember, a rational number is a number that can be written as a/b where a and b are integers and b≠0
A is irrational because the pattern doesn't repeatb is irrational because it's a crazy square rootC is irrationalD is not irrational, it is a fraction
The next 3 numbers to be highlighted would be 90, 99, and 108. multiples of 9 is like take 1 times 9 and 2 times 9 and etc. or you can just keep adding on 9 from the previous number like 81 + 9= 90
