I need help with this

The two angles form a a straight line which is equal to 180 degrees:

Make an equation:

57 + (x +23) = 180

Simplify:

x + 80 = 180

Subtract 80 from both sides:

x = 100

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+

25.45584

6 cars because if you have 8 and subtract 2 youll have 6 left over