you pay x for ten laps an you pay y for every additional lap you just multiply y by seven an add x
so all an all your answer would be (B)
You would use Pythagoras' theorem (a^2 + b^2 = c^2) because it is a right-angled triangle. 6^2 + 8^2 = 36 + 64 = 100. √100 = 10. So your answer is 10 miles, I hope this helps!
