1.

Evaluate 7 + 8 + 9 - 1 + 2 - 21 + 531). 452). 233). 574). 75

Answer»

Addition takes priority over subtraction, HENCE: 7 + 8 + 9 - 1 + 2 - 21 + 53

= 15 + 9 - 1 + 2 - 21 + 53

= 24 - 1 + 2 - 21 + 53

= 26 - 1 - 21 + 53 = 79 - 1 - 21

Simple subtraction: 79 - 1 - 21 = 57



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