Suppose that ln 2=a and ln3=b. use properties of logarithms to write each logarithm in terms of a and b

ln0.5

The solution to the problem is as follows:

ln(0.5) could be written as ln(2) - ln(2) - ln(2) = a - a - a = -a 

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B, 0.4 repeats so it is rational and square root of 16 is 4 so that is rational as well.

Chope that