The centers of Marathon County, Bayfield County, and Dodge County all lie along a straight road. If Marathon County is equidista
nt from Bayfield County and Dodge County, what is the distance from Bayfield County to Dodge County if the distance from Marathon County to Dodge County is 487 miles?
The three centers of the counties lie along a straight line. Since Marathon County is equidistant from Bayfield County and Dodge County, then Marathon County is exactly at the midpoint of the segment from Bayfield County to Dodge County. The distances from Bayfield County to Dodge County and from Marathon County to Dodge County are equal. The distance from Bayfield County to Dodge County is
Draw out a number line. Make sure 4 is on the number line. At this location, plot an open circle. The open circle indicates "do not include this endpoint as part of the solution set". We shade to the right of this open circle.
Visually this describes all real numbers that are larger than 4.
