What are the steps to solving this question?

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?

What is the unit rate of, 75% high fiber chimp food to 25% high protein chimp food.

Factor and solve to find roots x squared -x - 90 =0