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16 more than the product of 5 and p

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?

Look at this pattern ; 1,4,9, number 10000 belongs in this pattern . what’s the place of this number?