Convert $634_7$ to a base 10 integer
Mellie, you have asked quite a few of these now.
Maybe this video will help you understand
https://www.youtube.com/watch?v=eq1vDQAZrfk
6347 = 6(7)^2 + 3(7)^1 + 4(7)^0 = 294 + 21 + 4 = 31910