Suppose you receive an allowance of $55 and your friend receives an allowance of $40 at the beginning of the month. If you spend $6 a day and your friend spends $3 a day, after how many days will you and your friend have the same amount of money?

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?