What number could be added to 0.40mL for the level of precision to be 0.01 mL

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.

I am not sure but check this out:

2.02 mL but im not sure if that's wright.

You're right. Then the other answers are 8.8331 mL and 0.154 mL