206k views
3 votes
Express the sum without using summation notation. 5 9 i=1 O 1+ 2+ 3+ 4+ 5 O 9 + 9 + 9 + 9 + 9 O 9 + 18 + 27 + 36 + 45 O 9 + 45

Express the sum without using summation notation. 5 9 i=1 O 1+ 2+ 3+ 4+ 5 O 9 + 9 + 9 + 9 + 9 O-example-1
User Habibun
by
7.7k points

1 Answer

4 votes

The summation notation tells us

• Take the sum from i = 1 to i = 5

,

• The formula is "9i"

So basically we plug in "1" into "i" of the formula, sum it up with plugging in "2" into i of the formula. Then sum it up with plugging in "3" into i of the formula and so on until 5.

Hence, it will be:


\begin{gathered} 9(1)+9(2)+9(3)+9(4)+9(5) \\ =9+18+27+36+45 \end{gathered}

THe third answer choice is right.

User Michael Salmon
by
7.8k points

No related questions found

Welcome to QAmmunity.org, where you can ask questions and receive answers from other members of our community.

9.4m questions

12.2m answers

Categories