What is coefficient in the following expression: 5 a2 - 7

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?

Use the quadratic function to predict f(x) if x equals 8. f(x) = 25x2 − 28x + 585

Charlie tosses five coins.what is the probability that all five coins will land tails up.