Answer:
an arithmetic sequence or a linear function.
Step-by-step explanation:
<h2>
Arithmetic:</h2>
he has $100 and ADDS $20 each month. in arithmetic sequences we have a value for a sub 1 in this case 100, then add the rate of change or in this case 20 times the months or d. Since this function follows the rules this is an arithmetic sequence.
<h2>
Linear function:</h2>
y=mx+c
let y be the amount of money he has in his banking account,
let x be months.
let m be 20 because that is what he adds per month or per x.
let c be the starting value or 100.
y=20x+100
