expedite the the quality of service transportation and add the speed of transport. maybe this link is helpful to you http://www.econlib.org/library/ENC/PublicGoodsandExternalities.html
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Negative times negative is always a positive.
80... since -65 is a negative number, adding positive 80 will produce a value of positive 15.
well why can't pigs fly? same thing!
When multiplying integers, multiplying by the same sign will always produce a positive integer. Such as a negative times a negative equals a positive. If the signs are different then the product will be a negative.
It does not have to be positive or negative either one will produce reversal of the voltage applied by a factor