1. Which of the following is 0.000000708 written in scientific notations?
A.7.08×10^-8
B.7.8×10^-8
C.708×10^-10
D.70.08×10^-9

2. Which expression represents the largest number
A.40.1×10^-6
B.4.1×10^-7
C.0.411×10^-7
D.0.04001×10-5

3. Which expression is equal to 1 over 8000 written in scientific notations
A.8.0×10^3
B.1.25×10^-4
C.125×10^-5
D.1.25×10^4