```
cost = distance × (fuel efficiency)⁻¹ × fuel cost
```
In this case, the distance is 700 miles, the fuel efficiency is 29 mpg, and the fuel cost is $2.39 per gallon. Plugging these values into the formula, we get:
```
cost = 700 miles × (29 mpg)⁻¹ × $2.39 per gallon
cost = 700 miles × 0.03448 gallons/mile × $2.39 per gallon
cost = $53.47
```
Therefore, it would cost approximately $53.47 to drive 700 miles in a car that gets 29 mpg and gas costs $2.39 per gallon.
