exam Maths Puzzle Numerical Ability

Could someone explain how to factor this problem?
-24ab^2+9ab-12a^3b
Factor the greatest common factor. I am totally lost on this one! Help

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exam Other Question

Graphing Linear Realations:
graph the equation. Using the most suitable method.

y= -2/3x+5

please help me I am so lost Complete: If f(x)= (x+2)/3, then the value of f(0) equals ______