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Judah
Mathematics
15 December, 04:39
What is the sum of the series?
10
Σ (7k - 2)
k=1
+5
Answers (
1
)
Sanai Doyle
15 December, 05:00
0
365
Step-by-step explanation:
The simplest method is to substitute values of k = 1 to 10 into the expression and sum the terms, that is
7 (1) - 2 + 7 (2) - 2 + 7 (3) - 2 + 7 (4) - 2 + 7 (5) - 2 + 7 (6) - 2 + 7 (7) - 2 + 7 (8) - 2 + 7 (9) - 2 + 7 (10) - 2
= 5 + 12 + 19 + 26 + 33 + 40 + 47 + 54 + 61 + 68
= 365
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