The function f(x)=18000(0.52)x represents the value in dollars of a vehicle x years after it has been purchased new. what is the average rate of change in value per year between years 4 and 8?

How can you tell when x and y are not directly proportional?

Hannah paid $3.20 for 16 ounces of potato chips. hank paid $3.23 for 17 ounces of potato chips. who paid less per ounces?

Tony is charged $ 50 and additional $0.15 per miles for renting a car. a) represent the cost of renting a car with an equation,and the determine the cost if he drove it70 miles.b) what would be the cost of a car rental if the car was driven 250 miles? show work