Answer:
The function will be: f(n) = 2n
Step-by-step explanation:
An arithmetic sequence is a sequence where the common difference between consecutive terms is same
The sequence according to given information is:
2,4,6...
Here
a_1 = 2
a_2 = 4
a_3 = 6
the common difference will be:

The arithmetic sequence is given by:

Putting the values

Hence,
The function will be: f(n) = 2n
U subtract 4x by 5x and then you add 3 by -21 and the answer is x=18
Answer: 16 2/3 divided by 1/6= 100
I=$52,000
R=6.75%
T=5.5 years
P=$19,305