The value of three in 6,300 is 3,000 because it is in the thousands place. The three in 530 is in the hundreds place making the value of three 300. Hope that this helps you :D
Answer: 
Step-by-step explanation:
Using the values
and
, the slope is
.
So, the equation is:

The answer is 3.10 because the 4 is in the hundredths place and if it’s 5 or more it would be 3.20 but in this case it’s lower than 5 so it would be 3.10