Find the sum of ∑4/k=1 (-4k)

asked May 11, 2022 150k views

5 votes

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6 votes

Answer:

Hello,

Answer C: -40

Explanation:

$\displaystyle \sum_(k=1)^4\ (-4k)\\\\=-4*\sum_(k=1)^4\ k\\\\=-4*4*(1+4)/(2) \\\\=-4*5*2\\\\=-40\\$

Ken DeLong answered May 15, 2022

3.3k points

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