exam Maths Puzzle Numerical Ability

find a graph for:
1/2 x-4
2x-4
1/2x+4
2x+4

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exam Other Question

I could really use some help with this:
Solve the problem:
p(x)+-0.002x²+1.2x-300

Thanks in advance
express each answer in the form a+bi
25 over 1+2i would you multiply both top and bottom by 1-2i?