The key feature that all four function types (linear, quadratic, cubic, and exponential) share is:
The domain of all four function types is all real numbers.
This means that for each type of function, you can input any real number value for \( x \).
To clarify the other options:
- The minimum value of all function types is (0, 0): This is not true for all functions; for example, cubic functions can have both positive and negative values, and exponential functions never reach 0.
- The range of all four function types is all real numbers: This is not true; for example, quadratic functions have a range that depends on whether they open upwards or downwards.
- The x-intercept of all four function types is (0, 0): This is also not true; while some functions may pass through the origin, not all do.
Thus, the statement about the domain being all real numbers is the correct answer.
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