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Question: fe 4 5 and 6...

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#4 #5 and #6

V 4. Given that the sum of two of the roots of f (x)x3-3x2-25xk is zero, calculate all three roots and also the value of k. V5. A coin is biased so that it lands on heads of the time and tails ? of the time. If this coin is tossed six times, what is the probability that the coin lands on heads at least four times? Express your answer as a fraction in simplest form. V6. Prove that the following is an identity: tan x 1+cos x 5osn 8c05x 1-cos x sin x cos x =
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