Question

Marika is training for a track race. She start sprinting by 100 yards. She gradually increases her distance, adding 4 yards a day for 21 days. the explicit formula that models this situation is an=100+(n-1)4. how far does seh sprint on day 21

Answer 1

180 yards

Explanation:

The number of yards she sprints on day 21 can be found by evaluating the formula with n=21.

Solution

a21 = 100 +(21 -1)4 = 100 +(20)(4) = 100 +80 . . . . . use 21 in place of n

a21 = 180

Marika sprints 180 yards on day 21.