No.
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9x + 60 = 375 9x = 315 x = 35
Depending on your definition of a natural number, 0 may or may not be a natural number. If you don't think 0 is a natural number, then it will be the only non-natural number that is whole.
No - the ONLY natural number which has a reciprocal which is also a natural number is "1". All the other reciprocals of natural numbers will be fractions that are less than 1.
take 7 and keep it to the side as your whole number for you mixed number. take 0.375 and find a fraction equivalent. take 375 and divide by 1000 375/1000 = 0.375 = 75/200 = 15/40 = 3/8 this is your simpelst fraction form 7 3/8 is your mixed number
The first natural number is usually taken to be 1. The mean of one number is itself so the mean of the first natural number is 1.