f. 509-(-19) + (-19) + 20 + (-20)
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Answered by
5
Answer:
509
Step-by-step explanation:
= 509 + 19 - 19 + 20 - 20
= 509 + 0 + 0
= 509
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Answered by
1
Step-by-step explanation:
509 -(-19)+(-19)+20+(-20)
= 509
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