To determine intervals where the function is one-to-one using the horizontal line test, you need to identify sections of the graph where no horizontal line intersects the curve more than once. In simpler terms, the function should either be strictly increasing or strictly decreasing in those intervals.

Steps to determine the intervals:

1. Identify Critical Points: Look for points where the function changes direction (local maxima or minima).
2. Apply the Horizontal Line Test: For a function to be one-to-one over an interval, the graph must not cross any horizontal line more than once within that interval. This happens when the function is strictly increasing or strictly decreasing.

Looking at the graph in your image:

• The curve seems to have regions where it increases and decreases.
• Break down the graph into segments by analyzing where the curve changes direction (local peaks and troughs).

Interval Analysis:

1. First Interval (Increasing or Decreasing): Analyze the portion of the graph from the left end to the first peak.
2. Second Interval (Increasing or Decreasing): Analyze the portion between the first peak and the next trough.
3. Third Interval (Increasing or Decreasing): Analyze the portion after the trough, leading up to the next peak.

Conclusion:

Each segment where the graph is strictly increasing or decreasing will be an interval where the function is one-to-one.

Would you like a detailed breakdown of each interval on your graph, or do you have specific points you want to focus on?

Here are five questions to consider:

1. Do you need help identifying all local maxima and minima on the graph?
2. Are you interested in a step-by-step explanation of the horizontal line test?
3. Would you like to analyze the derivative to confirm increasing and decreasing intervals?
4. Should I help identify the exact intervals for one-to-one properties?
5. Are you looking for additional ways to verify if a function is one-to-one?

Tip: Remember that a function passing the horizontal line test is guaranteed to have an inverse.