Plz explain it step by step I’m trying to learn how to do these!!
20 points!!!

Henry is an avid reader, he devours 90 pages in half an hour how many pages has henry read per minute?

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?

How do you solving the solution of each system using elimination?