If he/she is saying vote by itself it would be votar.
Nosotras because it’s you and another girl and nosotros is we
Sentences are grammatically correct and make sense.
In the first one means:
We have as much pens as they do.
Second means:
They are as tall as us.
"tan" is the equivalent in English for "as much". The concordance is well done in both cases.
