Sue can clean the room in 45 minutes. ann can clean the room in 1 hour. sue cleaned for 15 minutes before ann came to her. how long did they work together to finish cleaning? write answer in fraction then write in decimal.

They will work for minute minute  together to finish the work.

Step-by-step explanation:

In 45 minutes Sue cleans the whole room

So, in 1 minute Sue does part of the total work -------(1)

so in 15 minutes Sue does

                    = part of the total work -------------------------(2)

So, the amount of work left, = (1 - 1/3)  

                                              = 2/3 of the total work.

In 60 minutes, Ann cleans the whole room

so,in 1 minute Ann does of the total work.

So, in 1 minute, Ann and Sue together do,

                                                    =

                                                    =  of the total work.

So, Ann and Sue together do  of the total work in 1 minute.

So, they would have done  the whole work in, minute.

So, they would do of the total work in

  minute

  = minute

  = minute

  minute

answer: it's d

step-by-step explanation:

hello from mrbilldoesmath!

answer:   (7x + 6y) ( 49x^2 - 42xy + 36y^2)

discussion:

in general, the factorization of a^3 + b^3 is

a^3 + b^ 3 = (a + b) ( a^2 - ab + b^2)

in our case note that 343 = 7^3 and 216 = 6^3 so the equation becomes:

343x^3 + 216y^3 = (7x)^3 + (6y)^3

if you think of a (above) as 7x and b as 6y the factorization becomes

343x^3 + 216y^3 =

((7x + 6y) (   (7x)^2 - 7x*6y + (6y)^2)   =

(7x + 6y) ( 49x^2 - 42xy + 36y^2)

you,

mrb

(a + b) (a^2 - a b + b^2)