Question

The geometric sequence graphed shows the number of mold spores in a Petri dish per day (please help!)

Answer 1

Answer: f(n) = 2 × f(n - 1) , n ≥ 2

Explanation:

Answer 2

f(1) = 2

f(n) = 2 × f(n - 1) , n ≥ 2

Explanation:

the point of coordinates (1 , 2) is on the graph

Then

f(1) = 2

…………………………

We notice that :

f(2) = 4

f(3) = 8

f(4) = 16

16/8 = 8/4 = 4/2 = 2/1 = 2

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This means the common ratio

of the geo sequence = 2

Hence ,

f(n) = 2 × f(n - 1)