How many ways can five people, a, b,c, d, and e, sit in a row at a movie theater if c must sit to the right of but not necessarily next to b?

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?