.004
No
No.
Yes.
Greater.
No. 6>4
0.4 is 0.36 more than 0.04
009 (9) is greater than 005 (5) by 004 (4)
.004 is 100 times as large as .00004.
mcg is the abbreviation for micrograms. 1,000 micrograms = 1 milligram (mg), so 40 mcg = .040 mg
No, they are both 4.