The least common denominator (LCD) is the least common multiple of the of the fractions. Does Anyone know the answer? we suck at maths.

[10 points, algebra 2]according to my answer key the restrictions are -1 and 4. but why not positive 1?

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 absolute value of -100000000000000?