Over a period of 5 hours, the outside temperature changed by an average of -2.5 per hour. Which statement correctly describes the change in the
temperature from the beginning to the end of the 5-hour period? *

A. The temperature decreased by 0.5 degrees Fahrenheit.

B. The temperature increased by 0.5 degrees Fahrenheit.

C. The temperature decreased by 12.5 degrees Fahrenheit.

D. The temperature increased by 12.5 degrees Fahrenheit.

yes. we do proportions in probabilities.

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

the answer is 99.