Identify the Declining Interval: Locate the Function's Decrease Near x = 1.3

To solve this problem, we need to determine the interval on which the function is decreasing. We have visual aid from a graph and a red line denoting $x = 1.3$. Upon inspecting the graph:

• The function appears to decrease between two points. This interval is crucial to identify, particularly in relation to the line $x = 1.3$.
• To determine the decreasing interval, note where the graph slopes downward. Upon doing so, the graph descends in the range between $x = -1.3$ and $x = 1.3$.

Therefore, the function decreases in the interval $-1.3 < x < 1.3$.

Given the choices, the correct choice is $1.3 > x > -1.3$.