exam Maths Puzzle Numerical Ability

I am having trouble obtain the correct answer for solving the following information:

F(x)= 2x^2 - 7x - 4

use the vertex and intercepts to sketch the graph of each quadratic f

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exam Other Question

The area of a rectangle of length x is given by 3x^2+5x. Find the width of the rectangle. Help please I do not understand this. Please hlep with this problem.
if x represents his original number of rabbits, then
1/2x -2=1/3(x-2)

please and thank you for any help