Answer:
Susan has used 668 minutes this month.
Step-by-step explanation:
This is kinda easy
Since it already says her phone plan allows her to use 835 minutes per month
And that she only has 167 minutes left
Basically all u wanna do is subtract how many minutes she has left from how many she gets per month
835-167=668
To recheck your answer all u would wanna do is addition
668+167=855
But yet again your final answer is 668
