What is the value of the expression 2.8*10^7/1.4*10^3

Which expression is equivalent to? assume x > 0 and y > 0.

Ann and betty together have $60 ann has $9 more than twice betty’s amount how much money dose each have

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?