exam Maths Puzzle Numerical Ability

Given f(x)=5x+3 and g(x)=x2-2 find each value

g(5)

5[g(3)]

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exam Other Question

World grain demand. Freeport McMoRan projects that in 2010 world grain supply will be 1.8 trillion metric tons and the supply will only be 3/4 of world grain demand. What will world grain demand in 2010 be? Supply equations
P=1/10q + 130
If p = $150
How many units will be produced
I do not know how to do this equation.
Can Someone help me?
Thanks