Final answer:
Karla should divide 7 kilometers by the conversion factor of 1.61 to convert it to miles since she is going from a larger unit to a smaller one.
Step-by-step explanation:
Karla is converting 7 kilometers to miles. To complete this conversion, she should be using a conversion factor which relates kilometers to miles. The conversion factor from kilometers to miles is that 1 mile is equivalent to approximately 1.61 kilometers. Since she is converting from a larger unit (kilometers) to a smaller unit (miles), she will need to divide the number of kilometers by the conversion factor.
Therefore, Karla should divide 7 kilometers by 1.61 to find out how many miles are equivalent to 7 kilometers. The calculation will look like this: 7 km / 1.61 km/mile = X miles.