Can you have help please

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

Which of the choices shown could be used to prove that aacp=abcp ?

Find the center and the radius of the circle with the equation: x^2-2x+y^2+4y+1=0?