brae72
18.09.2021 •
Mathematics
The equations in the graph above show the total cost (y) for renting a power washer for x hours from two different companies. For how many hours must you rent a power washer for the total cost to be the same for each company? What would that cost be?
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Ответ:
It is the first choice.
Step-by-step explanation:
This is a sequence where
the next term is obtained by adding 6.
first term = -9 + 6(0) = -9
second term = -9 + 6(1) = -3
third term = -9 + 6(2) = 3
4th term = -9 + 6(3) = 9
and 81 = -9 + (6*15).
So the answer is Sigma (-9 + 6n) from n= 0 to n = 15.