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Pleaseee help

How to determine whether two known pairs of points are on the same line.

Find the number of positive three-digit even integers whose digits are among 9, 8, 7,5, 3, and 1.

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?