<u>Answer</u>
sinx = -1
<u>Explanation</u>
The graph below shown is a sine wave (sine graph).
This is because; sin0 = 0, sin90 = 1, sin 180 = 0, sin270= -1, and sin360= 0. This can be confirmed in the graph shown.
The line shown is the line, y = -1.
The two intersect at sinx = -1
1. The interest is $45 and the amount is $545
2. Interest is $480 and the amount is $2480