In ΔWXY, m
∠
W
=
(
2
x
−
12
)
∘
m∠W=(2x−12)
∘
,
m
∠
X
=
(
2
x
+
17
)
∘
m∠X=(2x+17)
∘
, and
m
∠
Y
=
(
9
x
−
7
)
∘
m∠Y=(9x−7)
∘
. Find
m
∠
X
.
m∠X.

I’m confused on how to work the pie charts

How are algebraic expressions evaluated using substitution?

During the election for class president, 40% of the students voted for kellen, and 60% of the students voted for robbie. 500 students voted in total. how many more students voted for robbie than for kellen? answer with work : )