QuestionMarika starts sprinting 100 yards and adds 4 yards daily for 21 days. Find her distance on day 21 using $a_{n}=100+(n-1)4$. Options: A. 200 B. 184 C. 221 D. 180.

Studdy Solution
Finally, we add100 and80 to find the total distance Marika sprints on day21.
$$a_{21}=180$$So, Marika sprints180 yards on day21. The correct answer is D.180 yards.