exam Maths Puzzle Numerical Ability

How do you simplify a Rational Expression like this: 4x-12/4x, whats the answer?

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exam Other Question

The size of an insect population is given by the model P(t)=500e^0.02t where P represents the number of insects in the population at time t, and t represents time measured in days. The length of a rectangle is 2 in. more than twice its width. If the perimeter of the rectangle is 34in., find the dimensions of the rectangle.