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soriajimmy85
22.12.2019 •
Mathematics
Classify 3x^5-8x^3-2x^2+5 by number of terms.
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Ответ:
answer is-164
Ответ:
We can say that this is an arithmetic sequence because of the common difference.
The common difference, d, is equal to 4, and the first term is equal to 13.
The formula for the sum of an arithmetic sequence with n terms is given by
S_n= \frac{n}{2} [2a_1+(n-1)d]S
n
=
2
n
[2a
1
+(n−1)d]
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)(4)]S
5
6=
2
56
[2(13)+(56−1)(4)]
S_{56}=28\left[26+220\right]S
56
=28[26+220]
S_{56}=28\left[246\right]S
56
=28[246]
S_{56}=6888S
56
=6888
Therefore, there are 6,888 seats in all.