exam Maths Puzzle Numerical Ability

(4a^3B/a^2B^3)(3B^2/2a^2B^4)

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of the 427 people responding to a public opinion poll, 224 answered Yes to a certain question and 154 answered No. What percent of those responding were undecided? Answer should be to the nearest tenth of a percent. Can you graph the equation: y= -X^2-4X+5. If you can, please explan how u got the vertex and how to graph everything. Thanks.