Mathematics, 05.07.2019 04:30, 23espinosajose

Select the proper rearrangement and placement for parentheses to speed up the addition for the expression 2 + 9 + 8 + 1 a. (9 + 2) + (8 + 1) b. (8 + 2) + (9 + 1) c. (1 + 2) + (9 + 8) d. (8 + 9) + (2 + 1)

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Select the proper rearrangement and placement for parentheses to speed up the addition for the expre...