On a certain marathon course a runner reaches a big hill that is at least 10 miles into the race. If a total marathon is 26.2 miles, how can u find the number of miles the runner still has to go?

this would have to be an inequality equation.
Marathon is 26.2 miles
they get to a hill that is at least 10 miles into the race
26.2-10=16.2
so they have at most 16.2 miles to go
the equation is X<=16.2