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If x^2+y^2 = 6, and x+y=3, then what is x^3+y^3? 7^(x+1) + 7^x + 7^(x-1) = 399, what is x? W800: How many degrees C° does w800 reach? Current in a circuit increases linearly from 0 to 5A over 5 second total charge flowing through cicuit over duration is seniors plz give ans? Describe how and where new crust material is made. Describe how and where old crust is destroyed.?