This online class is tough, just need some help. Thanks

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

How do you solve a question like this?

If f(x)= sqrt4x+9+2, which inequality can be used to find the domain of f(x)?