The surface of the lake is at sea level, with an elevation of 0 feet. Tina swims to an elevation of -5 feet. Then she swims 5 feet up. What is Tina's elevation now?
5 feet
10 feet
O feet
-5 feet

no ,sorry if you needed it but you can ask and try to see if any one will anwser ,

step-by-step explanation:

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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

18.8cm hope i at all

step-by-step explanation: