4.) the angles are congruent, so they can be set to each other to determine the value of x.
14+6x=134
6x = 120
X=20
The angle would be equivalent to 180 (straight line) so,
134 +
6.) set the equation to 180 degrees (straight line)
36+[(x/3)+99]= 180
135 + x/3 = 180
x/3 = 45
X=45 x 3
X = 135
#2.) the angles are congruent, so again set the equation to each other and solve for x.
7x-4=87
7x=91
x = 91/7
x = 13
#4.) the sum is equal to 90 degrees (right angle)
81+(2x-51)=90
2x+30=90
2x=60
x=30
Hope this helps.