An introduction to base five is especially suitable for early learning in elementary school, as children can think of making change using quarters, nickels, and pennies. Use only these coins to answer the following. a. What is the fewest number of quarters, nickels, and pennies that can be fairly exchanged for 2 quarters, 3 nickels, and 6 pennies? b. How can the approach in (a) be used to write 70 in base five?