Freya is training for a track race. She starts by sprinting 200 yards. She gradually increases her distance, adding 5 yards a day for 21 days.
The explicit formula that models this situation is an = 200 + (n - 1) 5.
How far does she sprint on day 21?
A. 300 yards
B. 305 yards
C. 205 yards
D. 221 yards
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