The answer to this problem would be 0.0492.
Hope this helps
We have been given that

Now, we need to find an ordered pair that must be on the graph of

On substituting x=0 in the above equation, we get

Therefore, the required ordered pair is given by (0,-1)
The "one head and one tail" would be my best guess because you get one of each outcome, whereas the other two outcomes are two of the same outcome.
If you already know that you have . . .
1$ after week 1
2$ after week 2
4$ after week 3
8$ after week 4
. . . You can then tell that every week the money you save doubles (times 2)
So to continue . . . .
16$ after week 5
32$ after week 6
64$ after week 7
128$ after week 8
256$ after week 9
512$ after week 10
You will then know that after ten weeks u will have 512$ which is answer choice D.
Hope this helps! :)