Can someone help me find the equation on the line shown

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?

An ulcer medication has 300 milligrams in 2 tablets. how many milligrams are in 3 tablets?

You give a $4 tip for a meal that cost $22. approximately what percent of the bill was your tip?