Which is an example of the commutative property?
a. –13 27 = 27 (–13)
b. –21 (11 13) = (–21 11) 13
c. 4(–3 5) = 4(–3) 4 ∙ 5
d. –(–8 3) = 8 (–3)

Problem melissa is her dad build a walkway in their backyard. the walkway will be 54 feet long and 1.5 feet wide. the local hardware store sells tiles which are 1.5 by 1.5 feet and come in boxes of 12. how many boxes of tiles do they need?

Need this at the city museum, child admission is 6 and adult admission is 9.20. on tuesday, 132 tickets were sold for a total sales of 961.60. how many adult tickets were sold that day?

Two years ago a man was six times as old as his daughter. in 18 years he will be twice as old as his daughter. determine their present ages.