27.7-14=Cost above 500 msg
13.7=C
E=number of Extra messages sent
C=0.1E
13.7/0.1=E
137=E
Total messages=T
T=500+E
T=500+137
T=637
Danielle sent 637 messages in September
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Answer:
The answer to this is B, $135.
Step-by-step explanation:
I took the test.
The answer is D because you can multiply the second equation by -4
