Well, point slope is y - y1 = m(x-x1) So A and D are out. And the negative would cancel each other out for a positive, answer being, B.
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7.8 for 1 cake so add that to your total
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Water chlorination is the process of adding chlorine or chlorine compounds such as sodium hypochlorite to water. This method is used to kill certain bacteria and other microbes in tap water as chlorine is highly toxic to those microorganisms. Answer via google.
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2i, if you don't understand any of the steps let me know, I'd be happy to explain.
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so in order -4 = -1 * 4 so then 
then just solve each
