A survey was given to 309 people asking whether people like dogs and/or cats. 121 said they like dogs 180 said they like cats 60 said they don't like cats or dogs . How many said they liked both cats and dogs?

The revenue each season from tickets at the theme park is represented by t(c)=5x. the cost to pay the employees each season is represented by r(x)=(1.5)^x. examine the graph of the combined function for total profit and estimate the profit after four seasons