Help me please,
which one do I have to lock up?​

In simplified exponential notation, the expression a^2•a^-3•a 1/a 0

The function show two sisters' savings account and the rate at which they plan to deposit money

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