70% in the SIMPLEST Form​

Given ab and cb are tangents of p, and m =10°. what is the measure of abp?

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 r i 4.5+10r=-6.5 with work pls