30 points, .

2. michael decided to put some money in the stock market. he checks at the end of each day to see if the value of the stock has increased or decreased. the table shows the change in his stock value, in dollars, for the first 3 days.

(a) what was the total change in his stock’s value from day 1 to day 3? show your work.
(b) on day 5, michael said the total change in the stock value from day 1 to day 5 was zero. give possible values for the changes on day 4 and day 5. show your work