exam Maths Puzzle Numerical Ability

i am so confused on what 2 do

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Could you explain to me how to construct the equation of a parabola that has x-axis intercepts at (-2,0) and (4,0) ? 21: Refer to triangle DEF in Figure 5, if m Ang D = 30o, m Ang E = 60o, and DF = 12, what is ME in simplest form?