Answer:
The answer is option d
Step-by-step explanation:
The given formula is for arithmetic sequence is
f(9) = f(8) + 4
By using the formula an = a +(n-1)d
Where a is the first term and d is the common difference and n is the nth
term
∵ By substituting in the main equation we get
a + 8d = a +7d +4
d = 4
So by analyzing the options we get answer as option d
f(9) = f(1) + 32
a +8d = a +32
8×d =32
8×4 = 32
32 = 32
∴The answer is option d
