book Maths Puzzle Numerical Ability

I need help solving this polynomial. -2/3g^2h(12gh^3-3h)

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book Other Question

How do you find what F is in an equation like P=F/A My question says to solve the system of this inequalitie by graphing.
x<-4
y>2 (the > has a line underneath of it.)

I dont know how to solve this or graph it. could you hel