The function p(d)=5⋅4d−1 represents the number of people who receive a certain e-mail on day d of an e-mail experiment. what does the value 5 represent in this situation? five people received the e-mail on the first day of the experiment. there are 5 people running the experiment. every day, the number of people receiving the e-mail increases by 5%. every day, the number of people receiving the e-mail increases by 5.