HELP! A triangle on the coordinate plane has (-8,3),(3,9), and (9,3). What is the area, in square units, of the triangle?

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? half-life of a radioactive substance is 20 years. if you start with some amount of this? substance, what fraction will remain in 120 ? years

You eat $0.85 for every cup of hot chocolate you sell. how many cups do you need to sell to earn $55.25