Answer:
f(n) = 4n + 16
Step-by-step explanation:
n is the nth number in the sequence
plug in the first 3 to check the rule:
4(1) + 16 = 4 + 16 = 20
4(2) + 16 = 8 + 16 = 24
4(3) + 16 = 12 + 16 = 28
it works
