Question

please give answer
please
give correct answer​

Answer 1

ex.1

1) 2.07x10^7

2)1.54x10^-7

3)2.84x10^7

5)9.5x10^-5

4)3.16x10^8

ex.2

1)150000

2)0.00278

3)0.00039

5)0.00000000000068

4)0.00074