Question

Help me out on this one pliz i need help

Answer 1

First guess: 1200
Second guess: 106

Answer 2

Geometric sequence formula; 
A(n) = a*r^ n-1
A(6) = 100 * 2^6-1
A(6) = 100 * (2)^5
A(6) = 100 * 32 
A(6) = 3200