The distance from your house to the ice cream shop is 12 miles. Your best friend’s house is on the segment between your house and the ice cream shop, and his house is 3 miles from the ice cream shop. How many miles is your house from your best friend’s house?

The houses lie along the 12-mile stretch from your house to the ice cream shop. Your friend’s house is 3 miles from the shop, so the distance from your house to your friend’s house is 12 − 3 = 9 miles. The correct choice is D, 9 miles.

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