It is necessary to choose a single frame of reference when measuring motion because c<span>hoosing a meaningful frame of reference allows you to describe the motion in a clear and relevant manner.
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Jen used a card to make the purchase, and she received a bill within 15 days of the purchase. She paid $21.30 for the next 18 months until the bill was paid in full. The full payment included $58.60 in interest.