Answer:
that was my question!! but thx for posting it
I think is D , hope i answer fast enough haha :D
If the problem is with getting the base of 5 for your logarithm then on a TI Calculator you hit the MATH key and then go down to letter A which says logBASE( . Then click on that and it'll let you put a log base of 5. But here's what the graph should look like because it's a logarithm.
Multiply length of track by number of times run:
8 x 400 = 3,200 meters
1 km = 1000 meters
3200 meters / 1000 = 3.2 kilometers
Answer: 3.2 kilometers