We are to find the average rate for the mold over the 6 days
Day 0 = 1 square milliliter
Day 1 = 2 square milliliter
Day 2 = 4 square milliliter
Day 3 = 8 square milliliter
Day 4 = 16 square milliliter
Day 5 = 35 square milliliter
Day 6 = 64 square milliliter
Total days of mold = 7 days
Change in mold over a period of 6 days = 64 square milliliter - 1 square milliliter
= 63 square milliliter
Change in number of days = day 7 - day 1
= 6 days
Average rate = Change in mold over a period of 6 days / Change in number of days
= 63/6
= 10.5
Therefore, the average rate for the mold over the 6 days is 10.5 square milliliter
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