150 full time freshman, 150 full times sophomore, 150 full time juniors, and 150 full time seniors are asked how many hours they spend on coursework outside of class. Which sampling method?
1. Simple random sample
2. stratified sampling
3. systematic sampling
4. convenience sampling

geometry: triangles

solvers

lessons

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

think the answer would beb