The Nature Center sells bird seed for 75 cents per pound and sunflower seed for $1.10 per pound. To
the nearest pound, how many pounds of sunflower
seed should be used to create a 50-pound mixture
that sells for $0.90 per pound?

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?