To determine how many hours Christiana should work to make $130 for her car insurance after receiving an $18 tip, we can first calculate how much more money she needs after receiving the tip.
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Calculate the money she still needs after the tip: \[ 130 - 18 = 112 \] So, she needs $112 from her hourly wage.
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Now, we know she makes $14 per hour. To find out how many hours she needs to work to earn $112, we can set up the equation: \[ 14h = 112 \] where \( h \) is the number of hours she needs to work.
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Solve for \( h \): \[ h = \frac{112}{14} = 8 \]
Therefore, Christiana should work 8 hours.