Plz help 10 points plz I beg you

Kayla has a $500 budget for the school party. she paid $150 for the decorations. food will cost $5.50 per student. what inequality represents the number of students, s, that can attend the party?

Prove that 16^4-2^13-4^5 is divisible by 11.

Hi i’m not sure how to do question 20 if u could explain how to do it that’d b great