It is not very clear but it is suppose to be a sigma sign with 4 being the number to the top right of the sign and a -4 being the number to the bottom right of the sign.. Any help would be greatly appreciated Thanks!!
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Plug -4 into the equation.....and add up to 4.....so plug in -4,-3,-2,-1,0,1,2,3,4...the add up the total...
yea just plug four into the equasion and follow guy avove me;s steps