The shaded section of the graph represents all the possible combinations of time (x) and investment balances (y) for which:
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The bank guarantees a minimum balance from a safe investment account: This is represented by the inequality \( y \geq 2,000(1.045)^x \), illustrating that the balance will never go below this amount over time.
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The risky hedge fund provides a maximum balance: This is captured by the inequality \( y \leq -16x^2 + 96x + 2,000 \), which shows the upper limit of expected returns for that investment.
Thus, the shaded area between these two curves represents the "possible balances" for investments that fall within the range where the hedge fund might provide returns greater than what the bank guarantees as the minimum. Essentially, the shaded region indicates the potential outcomes of the hedge fund investment that are still above the guaranteed bank balance.
So, to summarize, the shaded section represents all the possible combinations of time (x) and investment balances (y) for which the hedge fund provides a financial return that is above the guaranteed minimum of the bank investment.