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Let's break down the problem. Hawa pays a parking fee consisting of:

1. **Automatic fee**: $7 just for entering the lot.
2. **Additional fee**: $2 per hour for every hour the car is parked.

### For 4 hours:
- **Automatic fee**: $7
- **Hourly cost**: 4 hours × $2 = $8
- **Total cost**: $7 + $8 = $15

Thus, for 4 hours, Hawa would pay **$15**.

### For $ t $ hours:
- **Automatic fee**: $7
- **Hourly cost**: $ t \times 2 $
- **Total cost**: $ 7 + 2t $

Thus, for $ t $ hours, the cost is $ 7 + 2t $.

Would you like further explanation on any part of this?

Here are five related questions you could explore:
1. What if the automatic fee was different? How would it change the total cost formula?
2. How much would the parking cost be if Hawa stayed for 6 hours?
3. If Hawa parked for 3 hours, what would be the total cost?
4. What if the hourly rate increased to $3 per hour? How would the formula change?
5. Can you plot the total cost as a function of time $ t $?

**Tip**: When dealing with problems that involve both fixed and variable costs, always separate the two components in your calculation.

Hawa is driving to a concert and needs to pay for parking. There is an automatic fee of $7 just to enter the parking lot, and when she leaves the lot, she will have to pay an additional $2 for every hour she had her car in the lot. How much total money would Hawa have to pay for parking if she left her car in the lot for 4 hours? How much would Hawa have to pay if she left her car in the lot for t hours?

Learn how to calculate parking fees using a linear equation involving an automatic fee of $7 and an additional hourly rate of $2. Understand how to compute the total parking cost for 4 hours and for t hours.

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