Quan did a lab in chemistry class and found that the substance he was given had a mass of 3.4 G and a volume of 1.2 6ML. his teacher told him the following densities : calcium 1.55G/ML, magnesium 1.74G/ML, aluminum 2.7 G/ML, Iron 7.87, silver 10.5 G/ML, lead 11.34G/ML. can you identify what substance Quan has?

how long did the flood last

step-by-step explanation:

then i will answer

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)