Retired cell phones contain 2100 metric tons of copper, 46 metric tons of silver, 3.9 metric tons of gold, 2 metric tons of palladium and, 0.04 metric tons of platinum. Currently gold is at 1500 dollars an ounce. There are 16 oz in a pound, and 2000 pounds in a ton. How much is the gold worth in recycled cell phones

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step-by-step explanation:

but which class are u may know that first

hello from mrbilldoesmath!

answer:

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

discussion:

the trick is to recognize that 343 = 7^3 and 216 = 6^3 and, in general,

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

in our case

343x^3+216y^3   =   (7x)^3 + (6y)^3

so take a = 7x and b = 6y in the above equation to get the answer.

you,

mrb