To model the number of gallons of gas remaining in Savannah's gas tank after driving for $t$ hours, let's break down the information:

• The car uses 1.25 gallons of gas per hour.
• The capacity of the gas tank is 10 gallons.

The amount of gas used after $t$ hours is $1.25t$ gallons. Since the tank starts with 10 gallons, the number of gallons remaining after $t$ hours of driving, denoted by $G(t)$, is the initial amount of gas minus the amount used:

$G(t) = 10 - 1.25t$

This equation represents the number of gallons $G$ of gas left after driving for $t$ hours.

Would you like further details or have any questions?

Here are some related questions to explore further:

1. How many hours can Savannah drive before the gas tank is empty?
2. How much gas is left after driving for 4 hours?
3. What happens to the gas remaining if Savannah drives for 8 hours?
4. If Savannah starts with half a tank, how would the equation change?
5. How many miles can Savannah drive if her car averages 20 miles per gallon?

Tip: Always check the units in word problems to ensure consistency when setting up equations.