Answer: 
Step-by-step explanation:
You need to use the following formula:

Given the points A(6,3) and B(8,1), you can identify that:

Now, you can substitute these values into the formula
.
Therefore, you get this result:


Answer:
d
Step-by-step explanation:
in ''d)'', all the numbers are irrational
1/3 of an hour = 20 minutes
8 hours = 480 minutes
So to find the number of periods we divide 480 by 20. Answer is 24
The answer to your question is option b because opposite angles in a quadrilateral are equal to one another