I Ms. Cornell has a goal of walks at least 18 miles. She walks at a rate of 4 miles per hour. Which inequality can Ms. Cornell use to sing, h, the number of hours to walk in order to meet or exceed her goal? 4h≥184 h is greater than or equal to 18 4h≤184 h is less than or equal to 18 4+h≥184 plus h is greater than or equal to 18 4+h≤18

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answer: it's d

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answer: c.  

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mixtures containing substances that get attracted to magnet can be separated using a magnet. we can separate iron from a mixture of sand and iron, as only iron attracts to the magnet.