Answer:
x = 45
x = 19
Step-by-step explanation:
A straight line = 180°
So,
12.
3x + x = 180
4x = 180
---- -----
4 4
x = 45
13.
(5x + 4) + (x - 2) + (3x + 7) = 180
Combine like terms:
(5x + 4) + (x - 2) + (3x + 7) = 180
9x + 4 - 2 + 7 = 180
9x + 9 = 180
-9 -9
------------------
9x = 171
----- -----
9 9
x = 19
Hope this helped.
Answer:
The first choice
Step-by-step explanation:
Put all the x together and add the whole number. This is what U will get