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29 October, 21:33

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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Answers (1)
  1. 29 October, 22:13
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    The correct answer is A) 300 yd.

    Using the formula, we have 200 + (21-1) (5) = 200+20 (5) = 200+100=300
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