The answer is D and it's pretty simple to do:
Answer: fifty four degrees (54)
Step-by-step explanation: Using the law of sines you'd multiply both sides by b then plug in the known values... sin(B)= 9/11xsin(80degrees). Then, you'd evaluate to find B and after solving you'd reach 54
You can not put this on here :)
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)](https://tex.z-dn.net/?f=S_n%20%3D%20%5Cfrac%7Bn%7D%7B2%7D%282a%20%2B%20%28n%20-1%29%20%2A%20d%29)
So,we have:
![10920 = \frac{n}{2}(2 * 220 + (n -1) * 16)](https://tex.z-dn.net/?f=10920%20%3D%20%5Cfrac%7Bn%7D%7B2%7D%282%20%2A%20220%20%2B%20%28n%20-1%29%20%2A%2016%29)
Evaluate the terms and factors
![21840 = n(440 + 16n -16)](https://tex.z-dn.net/?f=21840%20%3D%20n%28440%20%2B%2016n%20-16%29)
Evaluate the like terms
21840 = n(424+ 16n)
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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Its not a function because there are two ages that are the same.