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.
The product rule states that the multiplication of two or more logarithms with common bases is equal to adding the individual logarithms.
The value of x is 3.
Given
The following expression:

<h3>
What properties for Logarithms are used to solve the equation?</h3>
The following properties are used in the logarithms equation given below.
The product rule states that the multiplication of two or more logarithms with common bases is equal to adding the individual logarithms.
The bases are equal, the arguments are also equal;
Therefore,

Hence, the value of x is 3.
To know more about logarithms properties click the link given below.
brainly.com/question/26053315
Well what does star equal?
Since angles EFA, AFB, and BFC lie on a straight line, then they must add up to 180° (angle sum of a straight line)
So, 7x + 4 + 8x + 6 + 6x + 2 = 180
21x + 12 = 180
21x = 168
x = 8