What is the volume of a sphere with a surface area of 641cm^2? 167 pi cm^3

21 1/3 pi cm^3

481 pi cm^3

85 1/3 pi cm^3

225x²+4=0

225x²=0-4

225x²=-4

x²=-4/225

x=±√-4/225

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

hello, there is a new name in town and that's the human spider!

answer: d.) the total number of protons and neutrons is 15

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