Christiana makes $14 per hour working at the roller-skating rink. She needs to make $130 to pay her car insurance. How many hours should she work if she receives an $18 tip for hosting a birthday party that day?
Let h be the number of hours Christiana works at the roller-skating rink.
She makes 14h dollars from work.
With the tip, she makes 14h + 18 = 130 dollars.
Thus, 14h = 130 - 18 = 112 dollars.
So she should work h = 112 / 14 = <<112/14=8>>8 hours. Answer: \boxed{8}.
To find out how many hours Christiana should work, we need to subtract the $18 tip from the amount she needs to pay her car insurance ($130). This will give us the amount of money she still needs to earn without the tip.
$130 - $18 = $112
Now, we have the remaining amount that Christiana needs to earn, which is $112. Since Christiana earns $14 per hour, we can divide the remaining amount by her hourly wage to find out how many hours she should work.
$112 / $14 = 8
So, Christiana should work 8 additional hours to make enough money to pay her car insurance.
First, let's calculate how much Christiana earns per hour with the tip included.
Christiana makes $14 per hour for regular work + $18 tip for hosting the birthday party = $32.
Next, we need to determine how many hours Christiana needs to work to earn $130.
$130 / $32 per hour = 4.0625 hours.
Since Christiana cannot work 0.0625 of an hour, we can round up to the next whole number.
Therefore, Christiana needs to work approximately 5 hours to earn $130 to pay her car insurance.