The height, h, of a cylinder is 5 units less than 3 times its radius, r. Which expression represents the height of the cylinder in the terms of its radius

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What is the prime factorization of 23 ?me with this question

Sanya noticed that the temperature was falling at a steady rate of 1.4 degrees every hour from the time that she first checked her outdoor thermometer. by 6 a.m., the temperature had fallen 21 degrees. which expression can you use to find how many hours earlier she had first checked the thermometer?