Question

Choose the expression that represents the pattern of your sequence: 10, 20, 40, 80, ....

Answer 1

It's multiplying by 2 each time 10 x 2 = 20, 20 x 2 = 40, 40 x 2 = 80.

Answer 2

Multiply by 2 on each equation. 10 x 2 = 20 , 20 x 2 = 40, 40 x 2 = 80 
Hoped it helped :)