Marcus has $163 in his checking account. on monday, je wrote a check for $315. how much does marcus need to deposit into is account to prevent the account balance from dipping below the minimum of $25? ** solve the problem in an equation

he would need to deposit $152  to prevent the account balance from dipping below the minimum of $25.

315-163 would =152 so that's how I got me answer 

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