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nika2105 [10]
3 years ago
9

B)9f + 101 - 12fSimply ​

Mathematics
2 answers:
Ad libitum [116K]3 years ago
6 0

Answer:

-3f+101

Step-by-step explanation:

Sedbober [7]3 years ago
4 0

Answer:

-3f+101

Step-by-step explanation:

collect like terms first

9f-12f+101

subtract now

9-12=-3

-3f+101

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An online data base charges $25 an hour during the day and $12.50 an hour at night. If a research company paid $250 for 12 hours
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Answer

Find out the  which system of equations could be used to determine the number of hours charged at the day rate (d) and at the night rate (n) .

To proof

As given in the question

Let us assume that the number of hours charged at the day rate = d

Let us assume that the number of hours charged at the night rate = n

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Total working hour in a company including day and night be  12 hours .

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also

An online data base charges $25 an hour during the day

$12.50 an hour at night.

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than the two equation are

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n = \frac{50}{12.5}

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Hence proved



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