Question

evaluate the summation of 2n+5 from n=1 to 12

29
36
216
432

Answer 1

$\bf \sum\limits_{n=1}^{12}\ 2n+5\implies \sum\limits_{n=1}^{12}\ 2n+\sum\limits_{n=1}^{12}\ 5\implies 2\sum\limits_{n=1}^{12}\ n+\sum\limits_{n=1}^{12}\ 5 \\\\\\ 2\cdot \cfrac{12(12+1)}{2}+(12\cdot 5)\implies 156+60\implies 216$

Answer 2

Answer:

C) S = 7 + 9 + 11 +... + 29 <=> S = 216

Step-by-step explanation: