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Subtract sides 2x


Divide sides by 3


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CHECK :




So the value is correct.
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3 GBs per month because you have to take 30-21 (the monthly cost of the phone)=9 and each GB is $3 a month so 9 divided by 3= 3
Answer:
A. The two lines are neither parallel nor perpendicular.
Step-by-step explanation: