This alfebra problem

Negative 5 1/12 + negative 4 1/4 + 6 3/4

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?

Which equation represents a line that passes through the point (9, -4) and has a slope of 3/5?