Answer:
3) x=10
Step-by-step explanation:
9x-16 +3x+11 +7x -5 =180[ sum of
interior angle of
triangle ]
19x -10 =180
19x =190
x=10
4)
2x-12 +4x+43=9x -26
or, 6x + 31= 9x -26
or, 31 +26 = 9x -6x
or, 57 = 3x
or, 19 =x
reason of this question is given up
