exam Maths Puzzle Numerical Ability

If f(x)=2(3^x-2),what is the value of f(2)?

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(rs) radical sign

(rs)3*(rs)5 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