This is a question about the effective annual growth rate:

For each nominal exponential growth/decay described below, find the effective annual growth rate and express it as a percentage rounded to one decimal place.

A quantity has a half-life of 6 years. Its effective annual growth rate is ___ % per year.

A quantity has a tripling time of 9 years. Its effective annual growth rate is ___ % per year.

I need to fill in those blanks, how do I do that? If you could show me how that would be very much appreciated!