For this case, you must use the given expression, taking into account that: n = number of days. We have then that for day 21, n = 21. Substituting we have: a21 = 100 + (21-1) * 4 a21 = 180 Answer: she sprints 180 yards on day 21
it can't form isosceles triangle cause any two sides of the triangle are not equal ,it can't form equalateral triangle cause 3 sides of the triangle are not equal and neither right angle triangle so triangle can't be formed
