It would be 91.91 because it is closer to 100, or any other greater number than 81.9 is. You could also look at it as, when you count, the number that you say first, is the smallest. So in this case, you'll say 81 before you say 91.
Hope you understand it in the way that I meant it. (:
Coefficients are the numbers in from with the variable, the constant is just a number and the degree is the exponent.
The integer that represents spending $50 is -50
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