book Maths Puzzle Numerical Ability

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

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


f(x)=1/2x+2 the x value is -6
suppose that in 2000, the cost of a compact car averaged $13200 and in 2003 the cost averaged $15200. Assuming that the relationship between time(t) and cost(c) is linear, develop