PLEASE HELP (17-20) In 2004, an earthquake of magnitude 7.0 shook Papua, Indonesia. Compare the intensity level of that earthquake to the intensity level of each earthquake below.
17. magnitude 6.1 in Costa Rica, in 2009
18. magnitude 5.1 in Greece, in 2008
19. magnitude 7.8 in the Fiji Islands, in 2007
20. magnitude 8.3 in the Kuril Islands, in 2006

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step-by-step explanation:

what’s the question?

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