Before leaving, you stop to fill up your car with gas. You pump a total of 22.35 gallons. The cost per gallon is $1.79. What is the total cost to fill up your tank?

Let's break down the questions one by one:

1. Total cost to fill up your tank:

   • You pumped 22.35 gallons at a cost of $1.79 per gallon.
   • Total cost = 22.35 gallons * $1.79/gallon = $40.01.
   • Correct answer: $40.01.

2. How much money do you still owe?

   • Total cost of gas is $40.01.
   • Your friend gave you $31.56.
   • Money still owed = Total cost - Money given = $40.01 - $31.56 = $8.45.
   • Correct answer: $8.45.

3. How many miles will you be driving?

   • You need to drive 448.6 miles to reach your destination and you are driving the first half.
   • Miles driven = 448.6 miles / 2 = 224.3 miles.
   • Correct answer: 224.3 miles.

4. Total time spent driving:

   • You drove for 5/6 hour, your second friend for 2 1/8 hours, and the third friend for 3 1/2 hours.
   • Convert time to improper fractions for easier summation:
     • 5/6 remains as 5/6.
     • 2 1/8 = 17/8 (since 2 * 8 + 1 = 17).
     • 3 1/2 = 7/2 (since 3 * 2 + 1 = 7).
   • Common denominator for these fractions is 24.
     • 5/6 = 20/24,
     • 17/8 = 51/24,
     • 7/2 = 84/24.
   • Now sum them:
     • Total driving time = 20/24 + 51/24 + 84/24 = (20 + 51 + 84) / 24 = 155/24.
   • Convert 155/24 to mixed number:
     • 155 ÷ 24 = 6 remainder 11, therefore it's 6 11/24 hours.
   • Correct answer: 6 11/24 hours.

Here's a summary of the answers:

1. $40.01
2. $8.45
3. 224.3 miles
4. 6 11/24 hours