Answer:
IJ= 27
Step-by-step explanation:
HI+IJ=HJ
x+2x+9=4x
combine like terms
x=9
IJ=2(9)+9
18+9=27
IJ=27
1404
13*12*9
3
3x+3-x+3=12
3x-x=12-3-3
2x=6
x=6/2
x=3