chasitynicole12 chasitynicole12

09-03-2018
Mathematics

contestada

11. Select the proper placement for parentheses to speed up the addition for the expression 2 + 9 + 8 + 1
A. (8 + 2) + (9 + 1) B. (9 + 2) + (8 + 1) C. (8 + 9) + (2 + 1) D. (1 + 2) + (9 + 8)

Respuesta :

liemonder liemonder

11-03-2018

option A, because you quickly see that each part adds up to 10 so the total must be 20

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nukaworld2027 nukaworld2027

15-03-2018

the answer is c 8+9+2+1

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