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azamat
2 years ago
8

Help me pleaseeee thank you

Mathematics
2 answers:
slava [35]2 years ago
7 0
The answer is D 21t
For each day is an increase of 21
cestrela7 [59]2 years ago
7 0

Answer:

D

Step-by-step explanation:

Time is directly proportional to the Cost. And if you use the calculator you'll still get the answer by substituting the time into 21t

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