No. Technically by law he/she has to be 18. Even though at 17 he/she can consent. They are not legally able to make decisions for themseves. Trust me on this one I'm in the same kind of relationship.
YES
1720 is spelled seventeen twenty or seventeen hundred and twenty
twenty-six point one seven or twenty-six and seventeen hundredths or in currency twenty-six dollars seventeen cents
17/28 (read like "seventeen over twenty-eight" or "seventeen twenty-eighths"
.85
85%
It is 68%.
46
That is 85%
There are no dating laws so yes you can but you still have to have reached age of consent in your state to make sex legal.
20017
23,017