An exercise class had 20 people. if each person produced 2,200 btus of body heat during the class and the room is 30 ft × 40 ft × 15 ft, how many btus per cubic foot did they produce? (to the nearest hundredth) a) 0.12 btus/ft3 b) 1.83 btus/ft3 c) 2.44 btus/ft3 d) 36.66 btus/ft3

We are given the average body heat  equal to 2200 BTU. In this problem, we are asked to determine the total body heat  in BTU per cubic foot given the dimensions of the room. The volume of the room is 18000 ft3. we multiply the average heat by 20 persons.hence the answer to this problem is 2.44 BTU/ft3. 

The first one, i believe, would be correct. all the others have one thing in common, and that's that they have repeating numbers. in the second one, x and y have repeating 6's and 3's, and in the third, x and y have repeating 6's as well. in the last one, there are repeating 3's. the first one has no repeating numbers.