You are correct for all of them,
Precision goes up as you have more decimals. It gives you a more accurate measurement regardless of what it is measuring.
A line graph measures two variables, the X and the Y, and how they change based off of one another
And an educated guess would usually based on previous trends or results
I think it might be 7 don't know what answers you may have but its a guess
Recall that
where 
is the angle between the vectors 
whose magnitudes are 
, respectively.
We have
Answer: attached below
Step-by-step explanation:
