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?   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.five people received the e-mail on the first day of the experiment.