3. x 10^-1
Two-tenths mg
0.0075
0.6 mg, or you can say 600 micrograms.
It is 9/10 mg.
I assume you mean as an expression of a gram. A milligram is 0.001 grams. This is 1x10^-3 in scientific notation.
.3
3. x 10^-1
seven-tenths in decimal notation = 0.7
You can write two-tenths of a milligram as 0.2 mg.
Two-tenths mg
0.3 + 0.003 = 0.303
Seven and eight tenths can be written as 7.8 in decimal notation.
Three tenths.
0.3 = (0 x 1) + (3/10)
That would be written as 0.2 mg.
0.0075