Find the period of a sinusoidal function

(If u can answer this I have more like this)

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?

At 6 1/2 cents per pound of string beans how much does 7 pounds cost

What’s the answer ? use the picture to see the problem