Answer:
17(maybe)
Step-by-step explanation:
12-(-5)=17
7(a−3+4b)
distribute
7a-7*3+7*4b
7a-21+28b
9514 1404 393
x = 31
The sum of angles in a triangle is 180°.
98° +51° +x° = 180°
x° = 31° . . . . . . . . . . . . subtract 149°