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Ezra is training for a track race. He starts by sprinting 100 yards. He graduallyincreases...

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Ezra is training for a track race. He starts by sprinting 100 yards. He graduallyincreases his distance, adding 5 yards a day for 21 days.The explicit formula that models this situation is an = 100 + (n-1)5.How far does he sprint on day 21?A. 200 yardsB. 100 yardsC. 225 yardsD. 205 yards

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