Below are the scatter plot and residual plot for a set of data,
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A linear model
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the best fit for the data because the residual plot
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and is
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the answer is true.

this statement is true.

What do you need with it’s not a question your just stating what it says

Radon-222 or rn-222 has a half-life of 3.82 days. to determine the fraction of an original sample of rn-222 that remains unchanged after 7.646 days, we calculate the amount of rn-222 remaining after 7.646 days and divide it with the original amount. using 1 gram as a basis and using half-life calculation methods, we can determine that  0.249 or 0.25  grams of rn-222 will remain, and thus the fraction remaining is 0.25 or 1/4.