tolongg bantuin ngisii soal inii!!!
NotaSI Sigma
Penjelasan dengan langkah-langkah:
4. [tex]\sf \sum_{i =1}^5\ {7i}[/tex]
[tex]\sf = 7 \sum_{i =1}^5\ {i} = 7 (1+ 2 + 3 + 4 +5) = 7(15)= 105[/tex]
5. [tex]\sf \sum_{n =4}^7\ {4n-2}[/tex]
n =4 --> 4(4) - 2 = 14
n = 5 --> 4(5)- 2 = 18
n = 6 --> 4(6) - 2= 22
n = 7 --> 4(7) - 2 = 26
[tex]\sf \sum_{n =4}^7\ {4n-2} = 14 + 18 + 22+ 26= 80[/tex]
