Maggie's brother is 4 years younger than three times her age. the sum of their ages is 20. how old is maggie?

Which equations represents circles that have a diameter of 12 units and a center that lies on the y-axis? check all that apply

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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?