How to solve this A.P and G.P question?

Posted on 2015-08-18 11:12:00 in Math by MIKE

I really don't have any idea to solve this //(?o?)//

A sequence of numbers is formed by adding together corresponding terms of A.P. and a G.P. with a common ratio of 2.
The 1st term of the sequence is 48, the 2nd term is 73 and the 3rd term is 128.
Find the 4th term .
Write down an expression , in terms of n, for the nth term of the sequence.

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