Your stupid...
2+7-9-8=-8
The 2+7 cancel out the -9, so the answer is -8.
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To subtract fractions, you need a common denominator. In this case, the common denominator for 10 and 15 is 30. Therefore, nine tenths is equivalent to 27 thirtieths, and eight fifteenths is equivalent to 16 thirtieths. Subtracting 16 from 27 gives you 11 thirtieths. Therefore, nine tenths minus eight fifteenths is equal to 11/30.
Six plus four divided by eight times nine minus four is equal to 6.5
One whole is nine ninths. Nine ninths minus four ninths equals five ninths.
Wrong is simplest. Nine times Eight DOES NOT equal thirteen.