Scientific Notation and Prefixes

What is the correct scientific expression for 4mg?
1. 4 x 10^-3g
2. 4 x 10^-6g
3. 4 x 10^-9g
4. 4 x 10^-12g
What is the correct scientific notation for 8nF?
1. 8 x 10^-3F
2. 8 x 10^-6F
3. 8 x 10^-9F
4. 8 x 10^-12F
What is the correct scientific notation for 5μA
1. 5 x 10^-3A
2. 5 x 10^-6A
3. 5 x 10^-9A
4. 5 x 10^-12A
What is the correct scientific notation for 7mΩ?
1. 7 x 10^-3Ω
2. 7 x 10^-6Ω
3. 7 x 10^-9Ω
4. 7 x 10^-12Ω
What is the correct math expression for 3μs?
1. 3 x 10^-3s
2. 3 x 10^-6s
3. 3 x 10^-9s
4. 3 x 10^-12s
What is the correct math expression for 6pPa?
1. 6 x 10^-3Pa
2. 6 x 10^-6Pa
3. 6 x 10^-9Pa
4. 6 x 10^-12Pa
5. None of the above
What is the correct math expression for 1.5mT?
1. 1.5 x 10^-3Pa
2. 1.5 x 10^-6Pa
3. 1.5x 10^-9Pa
4. 1.5 x 10^-12Pa
What is the correct math expression for 45μC?
1. 45x 10^-3C
2. 45x 10^-6C
3. 45x 10^-9C
4. 45x 10^-12C
What is the unit preficx for 450x 10^-9m
1. 450mm
2. 450μm
3. 450nm
4. 450pm
What is the unit preficx for3.7 x 10^-6m
1. m
2. μ
3. n
4. p