O GRAPHS AND FUNCTIONS Hannah Word problem involving average rate of change Espan QUESTION Learning Page The number of bacteria in a culture increases rapidly. The table below gives the number /V (r) of bacteria at a few times / (in hours) after the moment when N= 1000. Time t Number of bacteria (hours) N (1) D 0 1000 3.4 1510 6.8 2292 10.2 3856 13.6 5080 (a) Find the average rate of change for the number of bacteria from 0 hours to 6.8 hours. [bacteria per hour (b) Find the average rate of change for the number of bacteria from 10.2 hours to 13.6 hours. bacteria per hour OO EXPLANATION