You are buying two kinds of notebooks for school. a three-ring notebook costs $6, and a spiral notebook costs $3. you must have at least five notebooks. the cost of the notebooks can be no more than $24.

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

answer: 1inch=7days  

12inch=12*7=84days

step-by-step explanation: