Answer:


Step-by-step explanation:
<u>Completing the square</u>
when 
Given equation:

Subtract 40 from both sides:

Divide both sides by 3:

Add the square of half the coefficient of
to both sides:


Factor the left side and simplify the right side:

Square root both sides:

Add 4 to both sides and simplify the radical:



Gram and milligram are in the metric system and are for weight. Pound is the United States system and kiloliter measures liquids
First one is -8.
Second one, I can't tell because I don't see it
Answer: 64+8=72...72/9=8
Step-by-step explanation: