The number of calories burned per hour for three activities is given in matrix N for a 140-lb woman training for a triathlon. The time spent on each activity for two different training days is given in matrix T. Calories/hr [ 540] Running N = | 400 Bicycling _360] Swimming Time Running Bicycling Swimming 1 hr 1 hr 30 min 45 min ] Day 2 [45 min 30 min] Day 1 1 hr a. Which product NT or TN gives the total number of calories burned from these activities for each day? b. Find a matrix that gives the total number of calories burned from these activities for each day.

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