Pre-calculus help? Please :( So confused!?

Just a Girl

New member
Can someone show me how you get the answers to the three following questions. I need to know how to solve these types of questions for my exam on friday!

1.) Condense the logarithmic expression 1/2 ln(x+1) - 1/2 ln(x-1) + lnC

2.) Use the change of base formula to write an expression in terms of logarithms to base e for log (base of 5) 10. What is the value to the nearest 0.01?

3.) Use the properties of logarithms to evaluate the expression log (base of a) 3 sqrt (a^2).

Thank you so so so much for your help!
So for 2 it would be 1.43?
 
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