Stephan has 3 pieces of wood. Each piece of wood is .45 feet long. If he puts them together end to end, how long would the wood be? (This is for my little brother)

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?