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Expand the series and evaluate: Enter your answer as the following example: -1-2-3-4-5-6=-21 sum_(k=5)^10(-5k)

Mathematics
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whats your best effort give us?
seeing this done a few times should give you an idea that we can build upon
Ok @amistre64, please leave me alone

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Other answers:

ok, but good luck with it all :)
Can someone help me please?
im willing to help, but ....
But what?
you said you dont want me to help you
I want help I just don't want to be criticized
noones criticizing you. I just need to know how much you know on this subject.
does the notation make sense for starters.
\[\sum_{k=5}^{10}\]is a good place to start
I know nothing
then this might take a bit. It is simple enough tho. the symbol: \(\sum\) is a greek letter for "S" and indicated that we are going to be adding up stuff
the number on the bottom tells us where we start at; and the number on top tells us where we end at: in this case we start with k=5 and end with k=10
ok
i like to write it out to begin with like this: k : rule ------- 5 : -5k = -5(5) = -25 6 : -5k = -5(6) = -30 7 : -5k = -5(7) = -35 8 : -5k = -5(8) = -40 9 : -5k = -5(9) = -45 10: -5k = -5(10)= -50 does this make sense so far?
\[\sum_{First}^{Last}(rule)\] using the rule, and stepping thru the numbers from first to last, we can generate all the numbers that are needed to be added up.

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