The function represents exponential growth (since the exponent is positive).
The percentage increase is, if I'm not mistaken, 181.3% (since 710 is just a constant, we don't need to worry about that - it won't affect the growth rate of the function)
6 is a quarter of her walk ... there are 4 quarters in a whole (6x4) = 24
-8/5 is the correct answer
