Input 12 for g in the equation.
c(12) = 3.7(12)
Multiply the right side of the equation.
c(12) = 44.4
c(12) = 44.4 is saying 12 graphing calculators costs $44.4
3x=x+40
2x=40
x=20°
The two angles are equal, because they are vertically opposite. So you can equate them and get the answer.
