chaseashley24
23.06.2019 •
Mathematics
Find the sum of 20 + 14 + 8 + + (-70)
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Ответ:
-400
Step-by-step explanation:
20 + 14 + 8 + ... + (-70) =
= (-6·1+26)+(-6·2+26)+(-6·3+26)+...+(-6·16+26) =
= -6·(1+2+3+...+16)+26·16 =
= -6·16·17/2+26·16 =
= -6·8·17+26·16 =
= -816+416 =
= -400
Ответ:
I got 39
Step-by-step explanation:
I found the area and subtract the area of triangle RST