The length of the sides of a square is given by the expression 4.8x + 2.4. Which expression represents the perimeter of the square? A.
4.8x + 2.4 + 4
B.
19.2x + 2.4
C.
8(2.4x + 1.2)
D.
4.8x + 9.6

C. 8(2.4x + 1.2)

Step-by-step explanation:

Usually the answer would be 4(4.8x + 2.4) but there is no option for that, although there is c which is technically

4 (2) (2.4x + 1.2) because you're dividing the expression into a half.

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step-by-step explanation:

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geometry: triangles

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call the larger triangle abc

then the smaller triangle cde is similar to abc (all angles are equal, aaa).  

ab is the side that is 36, and we wish to find de, the side corresponding to ab

area_cde = area_abc - area_cde --> area_abc / area_cde = 2

let x=length of de

ratio of areas = (ratio of sides)^2

+2+=+%2836%2fx%29%5e2+

+2+=+1296%2fx%5e2+

++x%5e2+=+1296%2f2+=+648+

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