Answer:
y=0.17x+50. His trip cost $50.85
Step-by-step explanation:
In the given graph, lets mark two points:
Let
and 
The slope of the line is given by:



The equation of the line is given by:






Therefore, the function equation represented by the graph is: 
Csc theta=-2 then theta equals csc^-1(-2) then theta would equal 5pi/6, 7pi/6
Your multiplying by -4 each time
-1x-4=4
4x-4=-16
-16x-4=64