Suppose that 6 people sitting in a enclosed room are each generating about 400BTU's of body heat per hour. if the room is 20ft×15ft×10ft, how many BTU's per cubic foot do they produce in 5 hours? 3BTU's/ft^3
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Summary statistics given for independent simple random samples from two populations. use the pooled t-interval procedure to obtain specified confidence interval. x1=71.6, s1=3.9, n1=11, x2=67.9, s2=3.4, n2=9 determine a 99% confidence level.

While on a train trip, marsha noticed that there were 35 people in her train car. after the next stop, there were only 21 people in her car. if p represents the percent decrease in the number of people in marsha's train car, what is p?

Angle a and angle b are both supplementary angles. what must be true about the angles?