book Maths Puzzle Numerical Ability

If the probability that it will snow on Christmas in Burlington, Vermont is 0.8, what is the probability that it will NOT snow?

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Could some one help me understand this problem?

The instructions are to solve the inequality. Find the vertex and intercepts, then graph it:
y = -2x^2 + 8x

Thanks very much
please help me solve this equation! f(g(x))
let f(x)=10x and g(x)=x+4