Mark is online buying songs to download to his smart phone. He has a $20 gift card. He sees that there is a one time fee of $10 to sign up. Then each song cost $1.99. Write the any quality that models the situation above.

These tables represent a quadratic function with a vertex at (0, -1). what is the average rate of change for the interval from x = 9 to x = 10?

Varies inversely with x. if y=8.5 when x=-1 find x when y=-1

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