the final temperature was -2 F, and that reflects a drop of 13 units, so
-2------0------------------------------------------------------+11.
12 x 16 = 192. So, the room is 192 square feet.
The 3 inside angles of a triangle need to add up to 180 degrees.
You have two angles of 104 and 36.
A = 180 - 104 - 36 - 40
The answer is 40
You can take 0.48 as a number, multiply by 100 to that and you get 48%
13x - y = 3 .....(1)
x - 6y = -33 ......(2)
eqn (2) × 13
13x - 78y = -429 .....(3)
(3) - (1)
13x - 78y = -429
13x - y = 3
(-). (+). (-)
_________________
- 77y = 431
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-77y = 431
y = 431 ÷ -77
y = -5.5