exam Maths Puzzle Numerical Ability

I don't know how to write the question for you.Because I can't draw the solid.
A= pier2 i got 346m2 for problem 16.
For problem 19) A-pie r2 128,4320=4448 50.2654,180

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If f(x)=2(3^x-2),what is the value of f(2)? A lever 12m long balances weights of 48 kg on one end and 24 kg on the other end. Find the lengths of the two arms of the lever.