Tobie is estimating the sum of the expression -50+51.Which reasoning would lead Tobie to the right answer?
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–50 + 50 is equal to -100 plus -1 is -101.–
–50 + 50 is equal to zero plus -1 is -1.–
–50 + 50 is equal to zero plus 1 is 1.–
–50 + 50 is equal to 100 plus 1 is 101.