Is 1.21221222 a rational number

It is a rational number

Step-by-step explanation:

Rational numbers include decimals and normal fractions, so it is rational

or

step-by-step explanation:

we need to solve for 'x' the following equation:  

we have that:

⇒

⇒ ⇒

factorizing, we get that:

  ⇒

then, the solutions are: or

nothing extraneous has been found!

i would say true? if the unit was informational and it "refreshed your understanding", then true.