Independent: cell phone plan
dependent: monthly cost
constant: per month/per minute (money)
Answer:
a) Josh likely made the negative and positive multiplication error.
b) -20a-8+12b
= -4(5a+2-3b)
Step-by-step explanation:
To check if you are correct, you can always simplify it again:
-4(5a+2-3b)
=-20a-8+12b
Remember:
Negative times negative equals to positive, negative times positive equals to negative!
I hope this is helpful! :)
Answer: 
<u>Step-by-step explanation:</u>
yellow or purple
+ 
= 
= 