Please can anybody help me out!

Adeli charges the same price, $5.50, for all of its different sandwiches. if a company ordered n sandwiches for a luncheon, which equation could be used to find the total price, p, that the deli charged for the sandwiches? a- n/5.50=p b-5.50n=p c-5.50/n=p d-5.50+n=p

Inez has a phone card. the graph shows the number of minutes that remain on her phone card a certain number of days.

Can someone me out here number 4 plz