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How fast does a fm radio wave travel.? Given that a and b are integers, I have to prove that ab(a^2 - b^2)(a^2 + b^2) is divisible by 30.? In projectile motion, why does increased vertical height cause a shorter horizontal distance? What function does starch serve in the seed? How can I factor x^16 + x^12 + x^8 + x^4 + 1 by hand?