Rick rents a car from a company that charges him $25 per day plus 10 cents per mile driven. which expression can represent the amount he owed on a recent rental?
a. 25x+0.1y
b. 25.1x
c. 25.1xy
d. 25.1+35y

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