Leroy took a trip to Alaska. His airfare was $243 and he spent $72 each day while he was there. Which expression can he use to help him find the cost of the trip?
(x = number of days spent in Alaska) *
72x + 243
72x + 243x
243 + 72
243x + 72

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

include a picture of the drawing in order for me to

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