Question

Marika is training for a track race. She starts by sprinting 100 yards. She gradually increases her distance, adding 4 yards a day for 21 days. Which explicit formula models this situation?

Answer 1

Answer:

(a+(n-1)d)

Step-by-step explanation:

Since Marika is increasing her sprinting distance equally every day, the model should be an Arithmetic Progression

Where,

a = 100

d = 4

n = 21

The AP would look like,

100 104 108 112 116 120 124 128 132 136 .... 180

The distance she sprints on the nth day can be written as (a+(n-1)d)