can you help me with these questions please

Insulin in the Body A patient who is diabetic receives 100 micrograms of insulin. The graph shows the amount of Insulin, In micrograms, remaining in his bloodstream over time, In minutes 100 (1 90) insulin (micrograms) (2.81) (3, 72.9) 50 10 15 20 time (minutes) 7. Scientists have found that the amount of insulin in a patient's body changes exponentially. How can you check if the graph supports the scientists' claim? 8.How much insulin broke down in the first minute? What fraction of the original insulin Is that? 9. How much insulin broke down in the second minute? what fraction is that of the amount one minute earlier? 10.What fraction of insulin remains in the bloodstream for each minute that passes? Explain your reasoning