Write an equation for the situation. use Y for the number of years and C for the total amount of money Gwen has $500 but he doesn’t take Ryan’s investment advice. she loses 1/4 of it every year for several years

At a pizza shop 70% of the customers order a pizza 25% of the customers order a salad and 15% of the customers order both a pizza and a salad if s customer is chosen at random what is the probability that he or she orders either a pizza or a salad