Answer:
12 + 20d
Step-by-step explanation:
OG fare = 12
Ticket price =d
20 Tickets =20d
So with this, you will be using proportions. In this case, our proportion is: 
Firstly, cross-multiply: x^2=144
Next, square root both sides of the equation, and your answer will be x = 12
Answer:
x = 35
Step-by-step explanation:
the 3 angles lie on a straight line and sum to 180° , that is
40 + 2x + 30 + 40 = 180
110 + 2x = 180 ( subtract 110 from both sides )
2x = 70 ( divide both sides by 2 )
x = 35