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If three grapefruit cost $1.00, why does one cost $0.34?

How can pictures help you solve math problems?

Is it easier to use words or symbols when describing mathematical relationships?

Why do people use letters, such as FBI or NASA, to identify organizations?

In math and science, certain letters and symbols are commonly used to refer to specific quantities, such as d for distance. What are some other letters and symbols that are used?
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