Log functions and exponentials. Please explain each step on how to solve. Thank you.

13. Expand the following Log ( (x2 + 6x + 9) / (x2-9) ) 14. Write an equivalent logarithmic equation for 6* = 12 15. Write an equivalent logarithmic equation for x' = 1516. 4%*2) = 200 17. The hydrogen ion concentration of a dilute solution of an acid is measured to be [H+] = 2.0 x 100*, Determine the pH of the solution. 18. After 5 hours an initial bacteria population of 100 members has increased in size to 500 members. Determine the exponential growth rate of the colony of bacteria. 19. What can you say about the function graphed here. Explain your reasoning: Is it a log or an exponential? For an exponential, is the exponent x or -x? What is the equation for the asymptote? Which direction and how many units is it shifted? 20. What can you say about the function graphed here. Explain your reasoning: Is it a log or an exponential? For an exponential, is the exponent x or -x? What is the equation for the asymptote? Which direction and how many units is it shifted