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Of four points are collinear, they are also coplanar

Aheated piece of metal cools according to the function c(x) = (.5)x ? 7, where x is measured in hours. a device is added that aids in cooling according to the function h(x) = ? x ? 2. what will be the temperature of the metal after two hours?

Atransformation t : (x, y) (x-5,y +3) the image of a(2,-1) is