Question

Yolanda owns 4 rabbits. She expects the number of rabbits to double every year.

Answer 1

Yolanda initially owns 4 rabbits.

For year 0 she has  4 rabbits.

Year 1 = 4*2 = 4*2¹= 8      since it doubles after every year, it will be multiplied by 2

Year 2 = 4*2*2 = 4*2² = 16

Year 3 = 4*2*2*2 = 4*2³ = 32

Year 4 = 4*2*2*2*2 = 4*2⁴ = 64

This is a kind of Geometric Progression.

Year  n = 4*(2ⁿ)

Answer 2

Double every year
year one
4 times 2
year 2
4 times 2 times 2 aka 4 times 2^2
year 3
4 times 2 times 2 times 2 aka 4 times 2^3
obviously


at year 'n' the number of rabbits will be
4 times 2^n