exam Maths Puzzle Numerical Ability

This question deals with doubling time. In the following exercise, give a doubling time for an exponentially growing quantity.

10. The initial population of a town is 15,600 and

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i need help because i dont understand how to do the problems on pages 78-79. i am supposed to be doing problems 11-19 odd.

if you could just help me to understand how i graph nubmers 11 and 13 im sure i could do the rest on my own. thanks. Please help me with solving this equation. I came up with the answer 5/6 but I am not sure that this is right. 6x + 4(3x - 2) = 6x + 2. Thank-you