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Fred has a piggy bank. On his twelfth birthday, he started saving money. Every week, on the first day of the week, he puts half of his $ 40 allowance into the bank. Write a formula for , the amount of money in his piggy bank days after his twelfth birthday, on the domain . You may assume that Fred's first deposit was made on his birthday, i.e. on day , which is on the first day of the week.

a) Fill in the missing values in the table below.

0

4

7

9

14

20

21

25

28

b) Which of the following graphs is a graph of the function ?