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5x21
1/4 one quarter
A trillion is followed by 12 zeros, and a billion is followed by 9 Zeros, so it is 5x21^10=5,000,000,000,000,000,000,000
It depends. It could equal either a negative number or a positive number, depending whether the negative number or the positive number is larger in absolute value. For example, -5 + 3 = -2, but -5 + 12 = +7.
no they do not