Mathematics, 25.06.2021 23:00 claytedd9894
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 there in total
Answers: 1
![S_n= \frac{n}{2} [2a_1+(n-1)d]S](/tpl/images/1384/2504/b48d4.png)
.![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](/tpl/images/1384/2504/abf4b.png)
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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...
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