Answer:
95 degrees
Step-by-step explanation:
Because angles 1 and 4 are vertical angles, they must be congruent. Therefore:
[tex]3x+10=4x-15 \\\\10=x-15 \\\\x=25[/tex]
Since angle 7 is supplementary to either of these angles, you just need to find the angle measure of either of them and subtract it from 180.
[tex]\angle 1= 3x+10=3(25)+10=75+10=85[/tex]
Subtracting this from 180, you are left with 95 degrees. Hope this helps!
