1,670,000,000 in scientific notation

If the sales price of a dvd is $20 and the markup is 34%, what is the cost of the dvd?

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?

Two numbers have a sum of -19. one number is x. what expression represents the other number?