Which number to 38 will result in a sum of 0

Find the value of x for which abcd must be a parallelogram -9-6x x-30

Find the multiplicative inverse of 8-12i

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?