It will increase by 5/9 of a degree.
If you convert the given equation into slope intercept form, you will have:
c = (5/9)f + 160/9
In this form, it is easier to see the slope. The line would be increase by a rate of 5/9.
Answer:
4
Step-by-step explanation:
Given that 


Now,


This can be written as
[as
]

[ by using equation (i)]
=4
Hence, 
I believe the correct answer is he paid the right amount