Thank you for the opportunity to help you with your question!

Analyze the transition (or
slope) between each adjacent pair of points. You can do this by first
graphing the function, or by comparing the y values of adjacent points.

#1 - From (1, 3.3) to (2, 4.9), the y values increase, so the slope is positive.
#2 - From (2, 4.9) to (3, 5.3), the y values increase, so the slope is positive.
#3 - From (4, 6.4) to (5, 4.5), the y values decrease, so the slope is negative.
#4 - From (5, 4.5) to (6, 5.6), the y values increase, so the slope is positive.
#5 - From (6, 5.6) to (7, 2.5), the y values decrease, so the slope is negative.
#6 - From (7, 2.5) to (8, 2.7), the y values increase, so the slope is positive.

Notice that there are four times when the slope changes polarity
(between #2 and #3, between #3 and #4, between #4 and #5 and between #5
and #6). These are the turning points for this graph.

Please let me know if you need any clarification. I'm always happy to answer your questions.