15 + 6 - 1 = 20
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If you subtract 15 from -6 you get -21. If you worked out the problem on paper, this is what it would look like. -6 - 15 = ? (change the minus to a plus, and change the sign of 15 from positive to negative) -6 + -15 = ? ( now you can add negative 6 plus negative 15 which equals negative 21) -6 + -15 = -21
-6+1= -5
The answer is four.
15 + 3 - (6 x 4) = -6
6 - (-9) = 15 15 + 2 = 17 17 - 4 = 13 is the answer.