Question

On the first day after the new moon, 2% of the Moon's surface is illuminated. On the second day, 6% is illuminated. Is the percentage illumination of the moon's surface a linear function of the day?

Answer 1

Explanation:

The days where it is illuminated is Day 13= 50% and Day 26=100%

Linear model:

Here A simple approach should be considered for linear model that begins at Day 1. In the case when the illumination is increased by 4% every day, so after 11 more days (after Day 2) it reaches 50%. In 13 more days, illumination reaches 100%.

Therefore, we can conclude that The days where it is illuminated is Day 13= 50% and Day 26=100%