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Which of the following would be a good name for the function that takes the weight of a box and returns the energy needed to lift it?

What is the simplified form of (3.25x10^3)(7.8x10^6) written in scientific notation?

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?