PLEAS ANSWEE Sally and Joan were able to dust the house in 3 hours together. It takes

Joan 10 hours to finish the same job alone. Without help, how long

would it take Sally to finish the same job ?

14hrs

Step-by-step explanation:joan=10hrs

                                           joan+sally=3hrs

representing joan and sally's time taken in fractions 1/10+=1/3

1/3-1/10=7/30

7/30 by 60min(in an hour)

=14hrs

geometry: triangles

solvers

lessons

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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 am not sure :

step-by-step explanation: