Write a numerical expression for the phrase and simplify it.-21 added to the sum of -5 and 9

A. 21 - 5 - 9; 7
B. -21 + [(-5) + 9]; -17 
C. -21 + 9 - 5; 35 
D. -21 + 5 + 9; -7 


Answer: B

Mathematics

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