Find the sum of the first 47 terms of the following series, to the nearest integer.
9,18,27,...
2 answers:
18 is the answer hood this will help you
Answer:
10152
Step-by-step explanation:
Common difference:
18-9=9
27-18=9
d=9
Explicit formula:
an = a1 +(n-1)d
a47 = 9+ (46)(9)
a47 = 423
Find sum: Sn = n(a1+an)/2
47(9+423)/2
47(423)/2 = 20304/2 = 10152
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