Here are some very good video that explain how. very short and easy too. http://virtualnerd.com/pre-algebra/linear-functions-graphing/rate-of-change-slope/finding-slope/slop... math antics on youtube is great for help too
Answer:

Step-by-step explanation:


Simplify

If you have any more questions please let me know.
Answer:
$2,540
Step-by-step explanation:
Given that Mrs Bain earns $30,483 per year.
We are asked to find the amount she earns in one month . Number of month is a year = 12
Total earning in 12 months = $30,483
Hence earning per month = 
= $2,540.25
We are asked to Write our answer correct to the nearest dollar. Nearest Dolllar is $2,540
Hence total earning per month will be $2,540