Question

Is someone willing to answer and solve this number 4 for me please I'll thank you

Answer 1

2 x 10^7= 20,000,000
4 x 10^6= 4,000,000
    20,000,000 - 4,000,000= 16,000,000.
In SI Notation its 16 x 10^6...
I don't really know it but i tried