The amount spent on calls per minute is an illustration of unit rates.
The amount spent on the 38-minute call is $113.62
The given parameters are:


So, the amount spent on call is:

This gives

Cancel out minutes


Hence, the amount spent on the 38-minute call is $113.62
Read more about unit rates at:
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Answer:
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Step-by-step explanation:
Answer: x = 24
Step-by-step explanation:
9x - 18 = 7x + 30
9x - 7x = 30 + 18
2x = 48
x = 48/2 = 24