Final answer:
To determine the amounts, we use the given information. On days 5, 6, and 7, Ebony's bank balance would be $400. To estimate the amounts on days 1, 2, and 3, we assume a constant rate of increase or decrease. We can show that Jade's statement is not true because Ebony's balance was increasing between Day 0 and Day 4, while it was decreasing between Day 8 and Day 12.
Step-by-step explanation:
(a) To determine the amounts on days 5, 6, and 7, we can use the fact that Ebony's bank balance reached $400 on Day 4 and the last day her balance was $400 was Day 8. This means that between Day 4 and Day 8, Ebony's bank balance remained constant at $400. Therefore, on Day 5, Day 6, and Day 7, Ebony's bank balance would also be $400.
(b) To estimate the amounts on days 1, 2, and 3, we can assume that Ebony's bank balance increases or decreases at a constant rate. Since her balance reached $400 on Day 4, we can estimate that her balance on Day 3 would be $300, on Day 2 would be $200, and on Day 1 would be $100.
(c) Without doing any calculations, we can show Jade that her statement is not true. Since Ebony's balance reached $0 on Day 12, it means that between Day 8 and Day 12, she was consistently withdrawing money. However, between Day 0 and Day 4, her balance was increasing.
Therefore, the amount of money she was putting into her account each day between Day 0 and Day 4 could not have been the same as the amount of money she was taking out each day between Day 8 and Day 12.