Can someone help to walk me through the steps of 2 problems that I don't understand. It was a part of a review test.

log,2x+3,(125)=3

and

How long it will take for $300 to double when invested at 6% annual interest compounded twice a year?

Thanks :)

Question

Can someone help to walk me through the steps of 2 problems that I don't understand. It was a part of a review test. 

log,2x+3,(125)=3

and 

How long it will take for $300 to double when invested at 6% annual interest compounded twice a year?

Thanks :)

anonymous · Answer

Is this the first one?
$$\log_{2x+3}125=3$$

anonymous · Answer

2.let x be the no. of years,then
$$600=300(1+\frac{ 6 }{ 200 })^{2*x}$$
find x