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Given the following piecewise defined functions, evaluate each of the problems below.
f(x)= {2x-7, when x<-2
{1/2x+3, when x≥5
{x^3+3x-4, when -2 ≤ x<5
1. f(0)
2. f(8)
3. f(-4)
4. f(-2)


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