Find the measure of ∠C if

∠A =
5
2
x + 30
∠B =
7
2
x + 40
∠C =
9
2
x + 10
∠D =
5
2
x + 20

The great thing about this problem is they give you everything you need to solve it easily. so the expression is: 12h+30w12h+30wand so everywhere you have an “h” you place 66. and everywhere you have a “w” you place 33. then the expression will look like this: 12(66)+30(33)12(66)+30(33)from here you multiply and then add. getting the following of: $785,862hope this