Hi Amy.
"پاسخ بده" is imperative mood it means "answer!" not "to answer" [to answer = پاسخ دادن Which is infinitive].
"پاسخ" means answer(noun) but "پاسخ بده" means answer(verb). "بده" means "give", so "پاسخ بده" = "give answer". That is better to say "answer".
So," حالا به پرسش ها ی زیر پاسخ بده" means "Now answer to the following questions".
If anything is not clear, then tell me, I'd like to explain it. ^^