Answer:
6.5 hours
Step-by-step explanation:
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21.....
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C= 25$ + 50$ * h
8 hours 425$
10 hours 525$
4¹⁸
(4⁻³)⁻⁶
= 4⁽⁻³⁾⁽⁻⁶⁾
= 4¹⁸
