The floor of a canyon has an elevation of -6.5 feet erosion causes the elevation to change by -0.25 feet per year. how many years will it take for the canyon floor to have an elevation of -20 feet.

54

Step-by-step explanation:

20 - 6.5 = 13.5

13.5 / 0.25 = 54

It would take 54 years for the canyon to erode 13.5 more feet to bring to -20 elevation.

idk

step-by-step explanation:

geometry: triangles

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answers archive

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