The first non-zero digit is 4 so to move the decimal point to just after it, you need to move it 7 places to the right.
So it is 4.28*10-7.
0.00215 in Scientific Notation = 2.15e-3
0.002001 in Scientific Notation = 2.001e-3
It is 5.301*10^7 in scientific notation
It is 3.49*10^7 in scientific notation
15100.00 in Scientific Notation = 1.51 x 104
0,000 000 042 8 = 4,28.10-8
It is 5.301*10^7 in scientific notation
0.00215 in Scientific Notation = 2.15e-3
0.002001 in Scientific Notation = 2.001e-3
It is 3.49*10^7 in scientific notation
15100.00 in Scientific Notation = 1.51 x 104
735,000 in Scientific Notation = 7.35 x 105
It is: 4.4*10^3 in scientific notation
0.0059 in Scientific Notation = 5.9 x 10-3
22,000 mg in Scientific Notation = 2.2 x 104mg
It is: 9.1*10^-4 in scientific notation
0.03056 in Scientific Notation = 3.056 x 10-2