Answer:
1/10
Step-by-step explanation:
-2/5 + 1/2
-4/10 + 5/10
-4 + 5/10
= 1/10
Hope this helps!
1 ug = 0,001 mg
0,0002 ug= x
x= (0,0002×0,001)/1
x= 2e-7