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The table below shows the number of calories used per minute as a function of an individual's body weight for three sports:

Activity	100 lb	120 lb	150 lb	170 lb	200 lb	220 lb
Walking	2.7	3.2	4	4.6	5.4	5.9
Bicycling	5.4	6.5	8.1	9.2	10.8	11.9
Swimming	5.8	6.9	8.7	9.8	11.6	12.7

a) Determine the number of calories that a 200 lb person uses in one half-hour of walking . calories

b) Who uses more calories, a 170 lb person swimming for one hour, or a 220 lb person bicycling for a half-hour?
A. The 170 lb person swimming for one hour
B. The 220 lb person bicycling for a half-hour
C. They both use the same amount of calories

c) Does the number of calories of a person walking increase or decrease as weight increases?
A. Increase
B. Decrease