exam Maths Puzzle Numerical Ability

determine the range for:f(x)=9-8x-x^2

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I have another radical problem. I am just not getting these at all. I feel the veins popping out in my forehead! I have to simplifiy the following problem. 2x divided by the fourth root of 3xy^2 hey I will really appreciate it if you could help me with this homework question:

A coin is tossed 8 times. Calculate the probability of tossing

a) 6 heads and 2 tails

b) 7 heads and 1 tail

c) at least 6 heads