Which expression represents the expression 20x-10 after it has been factored completely? SHOW ME WHAT YOU DID A. 2(10x-5)
B. 2(2x-1)
C.10(20x-10)
D. 10(2x-1)

it is A and D

Step-by-step explanation:

A. 2 * 10x is equal to 20x

and then 2 * 5 is equal to 10

so the answer is 20x-10

D. 10 *2x is equal to 20x

and then 10 * -1 is equal to -10

so the answer is 20x-10

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

i believe your answer is 99.7% of 7-year-old children are between 46.6 inches and 49.5 inches tall.