It is alarming that many people now are being infected by COVID-19. As the president of the student body in your school, you invited people to give a five-day series of talks through online conference on COVID-19 and its prevention every first Monday of the week for eight weeks from 9am to 10 am. On the first week, 25 students joined the conference . Finding it interesting , these students shared the video to other students and 30 more students joined on the second week, another 30 more students joined on the third week, and so on. Note: a. Assuming that the number of participants continues to increase in the same manner, how many participants were expected to join on the fifth week? b. How many participants were expected to join on the eighth week? c. How many participants in all joined the conference for the whole 8 weeks?​