Next year, Dana will be twice as old as her sister will be. Four years ago, Dana was three
times as old as her sister was. How old is each now?

The scatter plot shows the number of animal cells clara examined in a laboratory in different months: plot ordered pairs 1, 20 and 2, 60 and 3,100 and 4, 140 and 5, 180 what is the approximate predicted number of animal cells clara examined in the 9th month?