The number of cancerous cells c as a function of radiation dose r (measured in rads) is

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The number of cancerous cells c as a function of radiation dose r (measured in rads) is
c = r - 4
for r greater than or equal to 5, and is zero for r less than 5. r ranges from 0 to 10. What is happening at r = 5 rads?
Evaluate the above functions over the suggested range, sketch a graph of the function, and answer the biological question.
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