Question

A
∠A and
∠
B
∠B are supplementary angles. If
m
∠
A
=
(
4
x
−
16
)
∘
m∠A=(4x−16)
∘
and
m
∠
B
=
(
x
+
1
)
∘
m∠B=(x+1)
∘
, then find the measure of
∠
B
∠B.