Answer:
a.
2x+4x+3x=180 sum of interior angle of the triangle is 180
9x=180
x=180/9=20
b.
x-20+x+10+x-20=180sum of interior angle of the triangle is 180
3x-30=180
3x=180+30
x=210/3=70
c.x+10+x+20+x=180 linear pair
3x+30=180
3x=180-30
x=150/3=50
9-8.2-(-1.9) =
9-8.2+1.9
.8+1.9
2.7
-8-(-5.4)-1.8 =
-8+5.4-1.8
-2.6-1.8
-4.4
Alex has a higher score by 7.1.
To solve this problem you take the price of the object. 65 and add the percent increase to 1 and multiply. so 65 times 1.30. The answer you are looking for is $84.5. I hope I helped.