A bake sale earns 80$ from selling 50 brownies. Each brownie cost the same amount. How much was 1 brownie?

You can find the constant of proportionality by finding the ratio of

According to the general equation for conditional probability if p(anb)=3/7 and p(b)=7/8 what is p(a i b)

Charlie is at an amusement park that has 18 different rides. each ride costs $1.75. the function c(r) = 1.75r represents the total amount of money that charlie will spend if he goes on r rides, but he never goes on the same one more than once. what domain and range are reasonable for the function?