Question

Nathan has 80 stamps in his collection. He adds 1 stamp to it today. Each day he plans to add twice the number of stamps as the previous day. If he keeps adding stamps at this rate for n days, which recursive function represents the number of stamps he has on any day in the future?
The recursive function is_, starting at_ .

A) next=now+2^n A)80
B) next=now+2^n-1 B) 2^n
C) next=now-2^n-1 C)80^n

Answer 1

help please

Answer 2

I believe A

Answer 3

for which column?? @Theloshua

Answer 4

The left one

Answer 5

If A in the left column is chosen, then after 1 day he will have 82 stamps.
80 + 2^(1) = 82.
But he should have 81 stamps after 1 day.

Answer 6

So which of the choices will give 81 stamps after one day?

Answer 7

C??? @kropot72

Answer 8

C will give 79 stamps after 1 day.
80 - 2^(n-1)=80 - 1 = 79