Question

PLEASE HELP! MEDAL WILL BE AWARDED. I just need my answers checked!!

A rare bacterial culture is being grown in a lab. As the days progress, the cells multiply and grow.

After 1 day, there is only 1 cell.
After 2 days, there are 8 cells.
After 3 days, there are 18 cells.
After 4 days, there 31 cells.

Which recursive equation represents the pattern?

A. an=an-1+3n+1 <- my answer
B. an=an-1+3(n+1)
C. an=an-1+(n+3)
D. an=an-1+(n-3)

@welshfella

Answer 1

@welshfella

Answer 2

@sleepyjess

Answer 3

You can plug in the numbers to see check.