exam Maths Puzzle Numerical Ability

The length of a rectangle is 2cm more than 5 times its width. If the area of the rectable is 65cm^2, find the dimensions of the rectable to the nearest thousandth.
Do I use a pythagorean theorem to form an equation, I do not understand. please help

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exam Other Question
The kinetic energy of a particle of mass m is found by taking
one-half of the product of the mass (m) and the square of the velocity (v). Write
an expression for the kinetic energy of a particle. Q1. (x-1)(x-2)(x^2-9x+14)/(x-7)(x^2-3x+2)