She needs to be able to run 7.7 more miles a day.
In order to find this amount, we need to start by taking the amount she wants to run and subtracting what she is already able to. She wants to run 26.2 miles and can already run 18.5 miles.
26.2 - 18.5 = 7.7 miles
The reciprocal of seven (7) would be 0.142857143
Take the log (base 4) of both sides of the equation.



The appropriate choice is ...
m = -11/4