Ferric chloride is used as a flux in some types of extractionmetallurgy processes. This material is shipped in containers, and the container weight varies. It is important to obtain anaccurate estimate of mean container weight. Suppose that fromlong experience a reliable value for the standard deviation of fluxcontainer weight is determined to be 4 lb. How large a samplewould be required to construct a 95% two-sided confidence intervalon the mean that has a total weight of 1lb?

4 puzzles in 3 hours

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)

cant see photo

step-by-step explanation:

combine all like terms then its just a 2 step equation