exam Maths Puzzle Numerical Ability

I am not sure how to find the averege rate of change when a fraction is used. Can you please help me?

f(x) =3/x+2

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exam Other Question

the lenghts of the sides of a triangle are consecutive odd numbers. What is the length of the longest side if the perimeter is 45? This is stumping me

Solve the following system of linear inequalities by graphing.
x - 3y > 6
3x + 2y > 12