Mathematics, 18.09.2019 05:00, drunkelmo04

7- 21+ 13
a. regroup the integers.
b. add and subtract.
c. write the sum. 7 - 21 + 13 = _

Answers: 2

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7- 21+ 13
a. regroup the integers.
b. add and subtract.
c. write the sum. 7 - 21 +...