book Maths Puzzle Numerical Ability

i need help with evaluating functions. Can you help me with this problem

f(x)=1/2x+2 the x value is -6

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book Other Question

Solve the equasions x+4=-1: 5b=-25: 3x+4=13: 5(x-2)=15: x+8=3(x-4)i tried 4+1=5is it right Does this quadratic equation have a solution and how do I justify?
1. p2-4p+4=0, 2.m2+m+1=0, 3. 3z2+z-1=0