Answer:
The height is 8 yds
Step-by-step explanation:
The area of a trapezoid is given by
A = 1/2 (b1+b2) h where b1 and b2 are the lengths of the bases
108 = 1/2 ( 15+12) *h
108 = 1/2 ( 27)h
Multiply each side by 2
216 = 27h
Divide each side by 27
216/27 = 27h/27
8 =h
First, we need the volume of the room. We get this by multiplying the length, width, and height. This gives us 18,000 ft^3. Now, we see how many BTUs were created. We do this by multiplying 2,200 by 20. This gives us 44,000. Now, we divide 44,000 by 18,000 to get our answer, which is 2.44 BTUs/ft^3, or C.