Bharat sent a chain letter to his friends, asking them to forward the letter to more friends. The relationship between the elapsed time ttt, in days, since Bharat sent the letter, and the number of people, P(t)P(t)P, left parenthesis, t, right parenthesis, who receive the email is modeled by the following function:
P(t)=2401⋅(87)t1.75
Complete the following sentence about the rate of change in the group of people who receive the email.
The group of people who receive the email gains 1/7 of its size every
days.