What is the sum of a-1/abc^3 + 3-b/abc^3

Will give brainliest summations with algebraic expressions image shown

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?

How many solutions does the nonlinear system of equations graphed below have? a. one b. zero c. four d. two