Rodrigo tested 7 light bulbs in each string of lights before hanging them outside. Each string of lights has an equal number of light bulbs. Is this
sample of light bulbs from the strings of lights likely to be biased?

ab: 2 n83b8eb7ebi. 8e yen in

5x+10 is the correct one

hope this

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step-by-step explanation:

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