exam Maths Puzzle Numerical Ability

Value of 3 + 4x when x=2

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I need to find the closed form of this recursive function: a(n)= 5*a(n-1) where a(0) is the initial value? world grain demand Freeport McMoran projects the in 2010 world grain suply will be 1.8 million metric tons and the supply will be on 3/4 of world grain demand.
What will world grain demand be in 2010?
Thank you