34 and -14 as proven here:
Sum: 34 + -14 = 20
Difference: 34 - -14 = 48
just the opposite (when it says negative it gonna be positive)
I think this is how you do it
In this case, you already used 310 minutes out of 500 minutes monthly. So the remaining time for your cell phone should be: 500 minutes -310 minutes= 190 minutes.
You still have 1 week this month, that means the 190 mins time must be divided into 1 week or 7 days. Then the duration you of cell phone use for each day should be: 190 minute/7days= 27.14 minutes/day
For some reason I can’t see the picture sorry
