towlesam
16.10.2019 •
Mathematics
Aclassroom has stadium. there are 10 seats in the first row, 13 seats in the second row, 16 seats in the third row and so on. there are 56 rows what is the seating capacity of the class?
the classroom has 4,900 seats.
the classroom has 5,180 seats.
the classroom has 4,995 seats
the classroom has 5,348 seats
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Ответ:
B
5180
Step-by-step explanation:
a1 = 10
n = 56
d = 3
L = a1 + (n - 1)*d
L = 10 + 55*3
L = 10 + 165
L = 175
Sum = (a1 + L)*n/2
Sum = (10 + 175)*56/2
Sum = 185 * 56/2
Sum = 185 * 28
Sum = 5180
The answer is B
Ответ: