If 9< 4=(3x) and m< 8=(x+40) what is the measure of < 4? < 4 and < 8 are vertical

I'm thinking that 9 isn't supposed to be there in front of angle 4(?).  So I'm going to pretend that that is an angle.  If angle 4 and angle 8 are vertical, then they are congruent.  Therefore, 3x = x + 40.  2x = 40 and x = 20.  That means that the measure of angle 4 is 3(20) which is 60.  Angle 8 would be 60 also.  20+40=60

The answer is 16.64 feetyour welcome