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12.1 in a mixed number in simplest form = 121/10
Yes, it is. The word, "negative 10" isn't, cause its a word. But -10 is. If you do anything in word form, it won't be a number. In number form, yes.
Yes. -10 = -10/1 which is of the form of one whole number over another whole number. Rational numbers have the form of one whole number over another whole number. Thus -10 is rational.
Expressed as a mixed number in its simplest form, 73/10 is equal to 7 3/10 or seven and three tenths.
The number 4.44 x 10^10 in standard form is 44,000,000,000 or 44 billion.