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

Answer

300

Explanation

At first Freya started with 200 yards.

Then she gradually increased her distance by adding 5 yards a day for 2 days.

The formula for the model is given by;

X=200+(n-1)5. Where X=the distance she sprint on day 21

X=200+(21-1)5

X=200+ (20)5=300 yards

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