Abigail is trekking for several days in the Himalayan Mountains in Nepal. The function f(x) gives the maximum altitude she reached on day x of her trek. Altitude is measured in thousands of meters.

Question

What does f(7)=f(9) tell you?

Answer 1

The notation \( f(7) = f(9) \) indicates that the maximum altitude Abigail reached on day 7 of her trek is the same as the maximum altitude she reached on day 9. In other words, on both of those days, she achieved the same maximum altitude in thousands of meters. This suggests that either she maintained the same altitude on those days or that she returned to a previously attained altitude.