The principle of Park Middle School counted all the students in the seventh grade. She found that the ratio of boys to girls was 4:3. There were 42 girls in the seventh grade. How many boys were in the seventh grade?

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?