exam Maths Puzzle Numerical Ability

what do they want when it says simplify and what does the "and" mean in the question

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exam Other Question

i need to graph these three but i dont know how?

there all supposed two be graphed on one graph

(there three things to this problem)
y=2x^2
y=2(x-1)^2
y=2(x+3)^2

(there how do i find the measurement of a vertical angle