Disease A starts killing people in 1900 at the rate of 13000 people per year. Disease B starts killing people in 1910 at the rate of 20000 people per year. (a) Sketch on one diagram for the period 1900 to 1950 how many people in total have been killed by each disease. (b) How many people have died from these two diseases t years after 1900? For disease A? 13000t For disease B when 0 10? For disease B when 10 t?