Albert invested money into the stock market, and the table represents his earnings. What type of function could be used to model his bank account as a function of time? Justify your answer.

Week Balance ($)
1 1,400.00
2 1,470.00
3 1,543.50
4 1,620.68
This is a linear function because there is a common difference in the balance between the weeks.
This is a linear function because there is a common ratio in the balance between the weeks.
This is an exponential function because there is a common difference in the balance between the weeks.
This is an exponential function because there is a common ratio in the balance between the weeks.

Question

Albert invested money into the stock market, and the table represents his earnings. What type of function could be used to model his bank account as a function of time? Justify your answer.

Week	Balance ($)
1	1,400.00
2	1,470.00
3	1,543.50
4	1,620.68
 This is a linear function because there is a common difference in the balance between the weeks.
 This is a linear function because there is a common ratio in the balance between the weeks.
 This is an exponential function because there is a common difference in the balance between the weeks.
 This is an exponential function because there is a common ratio in the balance between the weeks.