Which expression is equivalent to 9(15)?
a) 9( 1+5 )
b) 9( 10+5)
c) 9( 1+50 )
d) 9( 10+50)

9(15) = 135

Option A: 9(1 + 5) = 9 + 45 = 54

Option B: 9(10 + 5) = 90 + 45 = 135

Option C: 9(1 + 50) = 9 + 450 = 459

Option D: 9(10 + 50) = 90 + 450 = 540

Hence, the answer is B.

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