Does someone know how to do this I don’t understand it

Ok so basically you square root the "Lengths " numbers at the top of the page. Using these answers ( the period/seconds numbers) you plot a graph
So, square root of 1.00 is 1

Square root of 1.96 is 1.4

Square root of 3.24 is 1.8

Square root of 4.00 is 2

Square root is 4.84 is 2.2

Square root of 6.25 is 2.5

Square root of 7.29 is 2.7

Square root of 7.84 is 2.8

Square root of 9.00 is 3

Then, you plot the numbers on the y axis. Also, did your teacher give you a specific graph to draw (such as a bar graph, column graph,line graph, etc?) because I'm not sure what graph you should draw. Hope this helps ;)

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