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

-0.39mL

Step-by-step explanation:

Let x be the number.

The expression would be: 0.40 + x = 0.01

Apply algebra to the equation to solve for x. You can subtract 0.40 from each side to simplify the expression. Here's what it should look like after applying algebra: x = -0.39

Therefore the answer is -0.39mL

the square root of what number? if you add that, then someone will probably answer the question.