Energy and mass are related by the formula e = mc^2
m is the mass of the object.
c is the speed of light
which equation finds m, given e and c?

m = e - c^2
m = ec^2
m = c^2/e
m = e/ c^2

Barney & noblet customers can choose to purchase a membership for $25 per year members receive 10% off all store purchases 1. how much would a member pay per year if he bought $50 worth of items each year? 2. write a slope-intercept equation that expresses how much a member pays per year using x to represent his purchases per year 3. how much would a member have to spend per year to pay off his membership fee?