Answer:
x=-17.......................
Step-by-step explanation:
x+17=0
Answer:
a= -3/7
b= -0.2
c = -2/8
Step-by-step explanation:
Answer:
715 minutes
Step-by-step explanation:
we know that
To find out how many more minutes he can use, subtract the number of minutes he has already talked from the number of minutes of his plan
Let
x -----> the number of minutes of his plan
y -----> he number of minutes he has already talked
so

we have

substitute
