Question 11

   (a)    If  f(ϰ)  =    and f(3)  =  21,  find f(x).

   (b)   The second, fourth and eight terms of an Arithmetic Progression (A.P.) form the first 
three consecutive terms of a Geometric Progression (G.P.).  The sum of the third and
firth terms of the A.P. is 20.  Find the
(i)  first four terms of the A.P.;
(ii)   sum of the first ten terms of the A.P.