Question

Sarah watched the Scarecrow scare away 2 crows on Monday 5 crows on Tuesday 11 crows on Wednesday and 23 crows on Thursday Sarah notice a pattern forming can you predict how many crows could be scared away on Friday Saturday and Sunday

Answer 1

I got 47 because...

Tn = Tn-1 + 3×2^(n -1)

Using the above formula,

T2 = 2 + 3×2^(1-1) = 2 + 3×2^0 = 2 + 3 = 5

T3 = 5+ 3×2^(2-1) = 5 + 6 = 11

T4 = 11 + 3×2^(3-1) = 11 + 12 = 23

T5 = 23 + 3×2^(4-1) = 23 + 24 = 47