1. simplify the expression and explain each step: 12+3(2y-3) 2. factor the expression completely: 18b-12

1. 12+3(2y-3)
distribute the 3 through the parentheses
12+6y-9
subtract
3+6y
2. 18b-12
factor out 6 from expression
6(3b-2)

It comes out of vehicles which pollutes the air

You have 2 sides that are 2 cms and you have 6 sides that are 1/2 cm and you have 4 sides that are 1 cm. the smallest sides are 1/2 the medium sized sides are 1 and the smallest are 1/2. so to find the perimeter you have to add them all up together so your answer will be 11 cm's