Angle addition postulate
1 answer:
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Answer:
The answer is (C) .
Step-by-step explanation:
Now, to find the equation for finding the length, in minutes, of a phone call that costs the same under either plan.
<em>Let the phone charges per minute be</em>
So, to get the equation of the phone plan A as the phone plan A charges $1.25 for the first minute and after that $0.15 for every minute:
Now, to get the equation of the phone plan B as given phone plan B charges a $0.90 connection fee and $0.20 per minute:
As, the phone call that costs the same under either plan.
Thus:
Therefore, the answer is (C) .