The fictitious country of Nittany Nation saw it's GDP per-capita increase from $6,374 in 1970 to $37,478 in 2015. What was the average annual growth rate over this time?

I am trying to watch a feedback video and the mod of the video is saying we need to raise the equation by 1/45th's but I am not sure what they mean by "raise it to". Everytime I do this equation, I come out with a negative number.