Answer:
f(1) = 2
f(n) = 2 × f(n - 1) , n ≥ 2
Step-by-step 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
________________________
This means the common ratio
of the geo sequence = 2
Hence ,
f(n) = 2 × f(n - 1)
The answer is most likly to be B.
Answer:



Step-by-step explanation:
Given


Solving (a1): The common difference (d)
d is calculated as

This gives:

Factorize:

Solving (a2): Sum of n terms
This is calculated using:

Substitute values for T1 and d


Factorize:


Solving (b): Sum of first 10.
In this case, n = 10
So:

becomes






