Determine the average rate of change in median age per year from 1930 to 1960.
a. -0.5 years of age per year
b. 20 years of age per year
c. -0.05 years of age per year
d. +0.05 years of age per year

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  answer:

  write 548 as 500 + 40 + 8. multiply each addend by 5. then add the three products to get 2,740.

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