Question 1185263
<pre>
0.35 for a half-mile amounts to 0.70 for a whole mile. 
The first half-mile costs 2.60, and the remaining {{{m-1/2}}} miles cost
{{{0.70(m-1/2)}}}


{{{F(m)}}}{{{""=""}}}{{{2.60+0.70(m-1/2)}}}

{{{F(m)}}}{{{""=""}}}{{{2.60+0.70m-0.35}}}

{{{F(m)}}}{{{""=""}}}{{{2.25+0.70m}}}

Or in slope-intercept form:

{{{F(m)}}}{{{""=""}}}{{{0.70m+2.25}}}

Edwin</pre>