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I know that this is my first post, but please help me! im having trouble with the following question

"The following data was collected from an experiment to measure the gamma ray count-rate at different distances from a sample of cobalt-60 The background count was measured five times. Background count (per minute) = 12, 14, 10, 15, 12.

Count (per minute) 413 161 92 60 43 35 26

Distance between source and detector (cm) 1.0 2.0 3.0 4.0 5.0 7.0 8.0

Plot a suitable graph to verify the inverse square law and use the graph to estimate the extra distance, d, between the source and the detector."

i have plotted the graph, but i am unsure on have to calculate the extra distance using it.

Thank you so much for all your help!

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# Plot a graph to verify the inverse square law and use the graph to estimate...?

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