The world record time for a certain swimming event was 63.2 seconds in 1950. Each year thereafter, the world record time decreased by 0.4 second.
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a) world record timing for 1965 R0=63.2 s
thereafter world record decreases 0.4 each year.
where t is the years since 1950
b) in 1975 t=1975-1950 =25
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