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Answered by
0
Answer:
Answer is 12
Step-by-step explanation:
Sum = n/2 (2a + (n-1)d)
636 = n/2 (18 + (n-1)8)
636 = n(9 + 4n- 4)
636 = 4n^2 + 5n
4n^2 + 5n - 636 = 0
x = 12 or - 13.25
Since the number of terms can't be negative
12 is the answer
Answered by
1
Answer:
12
Step-by-step explanation:
.........666......
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