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Lelechka [254]
2 years ago
9

Solve for x:x-7=-201)132)273)-134)-3​

Mathematics
2 answers:
Marianna [84]2 years ago
4 0

3.)-13

x-7= -20

x = -20+7

x= -13

blagie [28]2 years ago
4 0

Answer:

3)-13

Step-by-step explanation:

x-7=-20

Add 7 to each side

x-7+7=-20+7

x = -13

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The number of rows in the arena is 26

<h3>How to determine the number of rows?</h3>

The hockey arena illustrates an arithmetic sequence, and it has the following parameters:

  • First term, a = 220
  • Sum of terms, Sn = 10920
  • Common difference, d = 16

The number of rows (i.e. the number of terms) is calculated using:

S_n = \frac{n}{2}(2a + (n -1) * d)

So,we have:

10920 = \frac{n}{2}(2 * 220 + (n -1) * 16)

Evaluate the terms and factors

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Evaluate the like terms

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Expand

21840 = 424n + 16n^2

Rewrite as:

16n^2 + 424n - 21840 = 0

Using a graphical tool, we have:

n = 26

Hence, the number of rows in the arena is 26

Read more about arithmetic sequence at:

brainly.com/question/6561461

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