Answer:
a = 4
b=2
x=18
QR =16+1=17
Angle QRS =59
Explanation:
4a+1 = 2a + 9
2a = 8
6b = 11b-10
-5b=-10
-b= -2
6x+13 = 7x - 5 (opposite angles are equal)
-x=-18
Angle QRS = 180 - 18•6+13 =59 (PQR + QRS = 180)
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