Answer:
The number -0.39 ml could be added to 0.40 ml for the level of precision to be 0.01ml.
Step-by-step explanation:
Let x be the number could be added to 0.40ml .
According to question
If the number x added to 0.40 ml then we get precise level 0.01 ml .
therefore, we make an equation by using of addition property
x+0.40=0.01
x=0.01-0.40
Because when we put a number from left hand side of equal to and put on right hand side of equal to then the sign of the number changes .
therefore, sign of 0.40 changes in to negative .
Therefore, by solving equation
we get x= -0.39
Hence, -0.39ml is the number that could be added to 0.40ml for the level of precision to be 0.01 ml.
