The figure shows the movement of a pedestrian as she walks from point B to point E. Write a formula for function d(t) for each section: BC, CD, and DE. I got the answers for BC:d(t) and CD:d(t) which are 40-5t and 20 respectively; however the answer I inputted for DE, 20-5t is incorrect. Any ideas on the actual answer?

1948 olympics men's 100m freestyle swim finals competitor time wally ris 57.3s alan ford 57.8s géza kádas 58.1s keith carter 58.3s alex jany 58.3s per-olof olsson 59.3s zoltán szilárd 59.6s taha youssef el-gamal 1: 00.5s 2012 olympics men's 100m freestyle swim finals competitor time nathan adrian 47.52s james magnussen 47.53s brent hayden 47.80s yannick agnel 47.84s sebastiaan verschuren 47.88s cesar cielo 47.92s hanser garcia 48.04s nikita lobintsev 48.44s a. calculate the median and interquartile range for each set of data. make sure to label each measurement in your answer. b. make two inferences based on your results from part a. use complete sentences in your answer.