X+4x=35-20. 5x=35-20. 5x=15. X=3
It’s the 3rd option!
-5 (the bubble shaded black), the arrow going left towards -9.
Hope this helps!
Don’t keep your cool and tell her after class or tell her “Can you not”
Since they're vertical angles, they're equal in degree measure
since they're equal, we can make the two expressions equal to each other
5a - 1 = 2a + 20
add 1 to both sides
5a = 2a + 21
subtract 2a from both sides
3a = 21
divide both sides by 3a
a = 7
now, plug the answer you found for a into one of the two expressions
5a - 1 becomes (5*7) - 1, which equals 34
to double check that they're equivalent (since they're vertical angles)
2a + 20 becomes (2*7) + 20, which equals 34
both angles are 34 degrees!
A=100°
as 180-140= 40 , 40 x 2 = 80 & 180-80 = 100° = a
