A recent Harvard study concluded that people who drink coffee tend to live longer than those who don't drink coffee. The study followed more
than 20,000 nurses and doctors over a 30-year period, giving them
frequent questionnaires to answer about their coffee habits. Researchers
found that people who drank 3 to 5 cups of coffee a day had a mortality
rate during the study that is 15% lower than those who did not drink
What is the explanatory and response variable and what kind of study is it

3-4

step-by-step explanation:

the answer is 3-4 because both 45 and 60 has a multiple of 15.

45/3=15

60/4=15

therefore the odds against selecting a red is 4-3

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