book Maths Puzzle Numerical Ability

determine the sum for the geometric sequence:
n=12 , r=3 , T1 = 1/9

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book Other Question

A steel rod. 31 cm. long is to be cut into 3 parts, two of which parts are to be of equal lengths. The lengths of each of the 2 equal parts is 5 cm. more than the third part. Find their lengths. i was wondering how you find the inverse of the following problems:

f(x)= x+8
f(x)= 2x^4,_<0
f(x)= -x^5=6