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Anna007 [38]
3 years ago
10

4c+9=[8c+1-(2c-11)]/3 solve c plz .

Mathematics
2 answers:
Illusion [34]3 years ago
5 0

Answer:

c= -2 1/2

Step-by-step explanation:

atroni [7]3 years ago
3 0

4c + 9 = [8c + 1 - (2c - 11)] / 3

4c + 9 = [8c + 1 - 2c + 11] / 3

4c + 9 = [6c + 12] / 3

4c + 9 = 2c + 4

2c + 9 = 4

2c = -5

<em>c = -2/5</em>

Hope this helps! ;)

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A theater has 56 rows of seats. If there are 13 seats in the first row, 18 in the 2nd row, 23 in the 3rd row. How many seats are
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Answer:

8428

Step-by-step explanation:

According to the Question,

  • Given, A theater has 56 rows of seats. If there are 13 seats in the first row, 18 in the 2nd row, 23 in the 3rd row.

We have a number sequence  13, 18, 23, ...

  • We can say that this is an arithmetic sequence because of the common difference 'd', is equal to 5, and the first term 'a1' is equal to 13.
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Substitute the given values into the equation to solve for the sum of the 56 rows of seats.

S_56= \frac{56}{2}[2(13)+(56-1)(5)]\\S_{56}=28\left[26+275\right]\\S_{56}=28\left[301\right]\\S_{56}=8428

Therefore, there are 8428 seats in all.

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