A nurse starts at the hospital and travels to 5 appointments along a road. The positive numbers stand for going East. The negative numbers stand for going West. Which expression gives the total number of miles he travels to get to these 5 appointments?
a.|6 + -9 + 3 1/2 + -6 1/4 + -3/4|
b.6 – 9 + 3 1/2 – 6 1/4 – 3/4
c.|6| + |-9| + |3 1/2| + |-6 1/4| + |-3/4|
d.|(+6) + (-9) + (3 1/2) + (-6 1/4) + (-3/4)|