Answer: 15
Explanation: if the height of the frame is 12in, double that to represent the two sides. subract your sum from 54 and you will get 30, divide that in half
The answer is D. none of the above.
-0.1 - (x) = 0.3
-0.1 - (-0.4) = 0.3
-0.1 + 0.4 = 0.3
0.3 = 0.3 (true)
-0.4 is your answer
hope this helps