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What is the square root of 45? (step by step working plz)

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?

Ab and bc form a right angle at point b. if a= (-3,-1) and b= (4,4) what is the equation of bc?