Having trouble with this math question of my son's x2 + 3x -12

Which ratio is equivalent to 10: 85

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?

The sum of these consecutive integers is equal to 9 less than 4 times the least of the integer. find the three integers