Please answer the question stated below:

The angle of a triangle are given as 6x,(x-3), and (3x+7). find x then find the measures of the angles

Which number produces a rationale number when multiplied by 1/5

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?