Round the answer to the nearest cent. the price of an item selling at 150% of its $63 value is $

Which addition property is being illustrated below? (type commutative or associative) (6 + 7) + 1 = 6 + (7 + 1)

Which simplifys to a+ b? a-(1-b)+1 -(1-a)-b+1 (a--1) -1)+1

What numbers are included in the set of integers? what numbers are not included?