![\bf \displaystyle\left[2\sum_{n=1}^{7}~ n - 2\sum_{n=1}^{2}~n\right]+\left[ \sum_{n=1}^{7}~5 - \sum_{n=1}^{2}~ 5 \right] \\\\\\ \left[ 2\left( \cfrac{7(7+1)}{2} \right)-2\left( \cfrac{2(2+1)}{2} \right) \right]+\left[\cfrac{}{}(7)(5)-(2)(5) \right] \\\\\\ \left[ 2(7(4)- 2(3)) \cfrac{}{}\right]+\left[ 35-10\cfrac{}{} \right]\implies [2(28-6)]+[25] \\[2em] [2(25)]+[25]\implies 50+25\implies 75](/tpl/images/0174/5987/0e695.png)
Evaluate the sum from n equals three to seven of quantity two n plus five.
a. 75
b. 77...
Mathematics, 13.08.2019 00:30 sama3638
Evaluate the sum from n equals three to seven of quantity two n plus five.
a. 75
b. 77
c. 96
d. 98
Answers: 1
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