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In Exercises 49-54, assume that a constant rate of change exists for each model formed.
Records in the 400-Meter Run. In 1930, the record for the 400-m run was 46.8 sec. In 1970, it was 43.8 sec. Let R(t) = the record in the 400-m run and t = the number of years since 1930.
a) Find a linear function that fits the data.
b) Use the function of part (a) to estimate the record in 2003 and in 2006.
c) When will the record be 40 sec?
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