deaishaajennings123
26.02.2021 •
Mathematics
Select the correct answer. What is the sum of the first 17 terms of this arithmetic series? Use Sn=n(a1+an/2) .
-28 + (-13) + 2 + 17 + ⋯
A. 1,692 B. 1,564 C. 227 D. 212
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Ответ:
1564.
Step-by-step explanation:
First term = -28 and common difference = 15.
Sum = (17/2)(2*-28 + (17-1)15)
= 8.5 * 184
= 1564.
Ответ:
its not a right angled triangle
Step-by-step explanation:
this is because it doesnt follow the rule of pytagorous theorem