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What substitution should be used to rewrite 4x^4-21x^2+20 =0 as a quadratic equation
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When you flip a biased coin the probability of getting a tail is 0.6. how many times would you expect to get tails if you flip the coin 320 times?
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What substitution should be used to rewrite 4x^4-21x^2+20 =0 as a quadratic equation...
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