Question

Find the 10th term of the following sequence:

5, 10, 20, 40, 80

Answer 1

An=a1*(q^n-1); a1=5; q=a2/a1=10/5=2;
A10=5*(2^10-1)—> A10=5*2^9=5*512= 2560

Answer 2

Answer: 5120

Explanation:

You amplify 80 by 2, then 160 by 2 and so on