Please help I don’t get these 45 to who can help me

(1)
3x+11 + x+21=180
4x=148
x=37. Plug in 37
3(37) +11 =122
14y-4=122
14y=126

y=9 (red)

(8)
13x-33=10x
-33=-3x
11=x
5y=10(11)
5y=110
y=22 (blue)

(9)
27x+4+8x+1=180
35x+5=180
35x=175
X=5
8(5)+1=y+10
41=y+10
31=Y (Pink)

(10)
Not sure on this one so sorry
16x-4+9x-6=180
25x-10=180
25x= 190


(11)
x+8+6x-58=90
7x-50=90
7x=140
X=20 (dark brown)

(12)
7x-7=3x+45
4x=52
X=13

63 + 3(13)+45 + y-6 = 180
141 + y = 180
Y=39 (Orange)

The answer is poppy pants69

c) 6

step-by-step explanation:

let pq = qr = rs = x, and xz = y and zu = z.

if the horizontal lines are parallel, then corresponding segments are in proportion:

substitute:

therefore 3 = y = z.

xu = y + z → xu = 3 + 3 = 6