MODERATE EXERCISES-Logarithms

(4) Solve each equation.

1. 100 = 50e^-x
   
   
2. 1/4 = 5^2t-1
   
   
3. ln (2x+5) = 0
   
   
4. log_x 6 = 1/3

HINT: In some cases, writing the statement in exponential form will help. In others, try taking logarithms of each side of the equation.