Answer:
Try this option, note: only calculation is performed, the last two question are missed.
Explanation:
to calculate 'x':
the rule: m∠BAC+m∠ABC+m∠BCA=180°; if to substitute m∠BAC=4x+10,m∠ABC=12x-6,and m∠BCA=3x+5, then 4x+10+12x-6+3x+5=180°; ⇔ x=9.
to calculate m∠BAC; m∠ABC; m∠BCA:
m∠BAC=4x+10; ⇒ m∠BAC=36+10=46°;
m∠ABC=12x-6; ⇒ m∠ABC=108-6=102°;
and m∠BCA=3x+5; ⇒ m∠BCA=27+5=32°.
to calculate the angle 1 and 2:
the fule is: m∠1+m∠BAC=180° and m∠2+m∠ABC=180°.
Then m∠1=180-m∠BAC=180-46=134°;
m∠2=180-m∠ABC=180-102=78°.