Answer:
C
Step-by-step explanation:
(0.1x-22)+(0.3x-54)=90
First combine like terms
0.4x - 76 = 90
Now add 76 on both sides
0.4x = 166
Divide by 0.4 on each side to isolate x
X= 415
On the bottom left, the answer is subtraction property of equality because you need to subtract 4x to the 7x to simplify the equation.
It would have to be an obtuse triangle
