Question

Which is a recursive rule for the sequence 9,14,24,44,84?
a) a1 = 9, an = a[n-1]+5
b) a1=9, an = a[n-1]+10
c) a1=9, an = 3a[n-1]+13
d) a1=9, an=2a[n-1]-4

Answer 1

So try the first one:
a1 = 9
an = a[n-1] + 5, which means:
a2 = a[2-1] + 5 = a[1] + 5 = a1 + 5 = 9 + 5 = 14

It fits so far. Repeat for the rest of the numbers.

Answer 2

Okay got it, would it be A? @bahrom7893

Answer 3

can you post your solution? (The steps you took to check it?)