Passes through (1.2) and (3, -8). with y=mx+b
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1.30 represents the rate of growth of the mold spores. This decimal is a representation of the percentage growth, which would be 130%.
Since the function is written in terms of weeks, x will equal 4 to represent the amount of spores after 4 weeks. Plug the value into the function:
Rounded to the nearest ones value, there will be 985 mold spores after 4 weeks.