Answer:
6x+9x+4-11=21x-7
15x-7=21x-7
15x-21x=0
x=0
D
Step-by-step explanation:
2,160
20 divided by 4 is 5 so
4$ will be for pay as you go.
5$ will be for regular deal
4+5=9 so the all in one deal is 9$
