Gary rearranges the television set and the sofa in his living room. The positions of their centers are shown in the diagram. What distance between the centers? A)5sqrt units b) 7 units c) 8sqrt5 units d) 9 units e) 9sqrt5 units

Martha is training for a duathlon, which includes biking and running. she knows that yesterday she covered a total distance of over 55.5 miles in more than than 4.5 hours of training. martha runs at a speed of 6 mph and bikes at a rate of 15.5 mph.