URGENT In a sample of 30 coin flips, heads came up 15 times. What is the sample
proportion for heads?
A. 0.2
B. 0.5
C. 0.1
D. 0.6

i think the answer is b.

step-by-step explanation:

not 100% sure though.

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

step-by-step explanation: 4 cause 2+2=4