Please help! Will give 20 points and a brainliest!

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 ratio fraction form of 25: 9

Find the length of the normal and the angle it makes with the positive x-axis. (see pictured below)