Answer:19.42 is the answer
Step-by-step explanation:
Answers:
a) 
b) 
c) 
d) 
Step-by-step explanation:
In this case we are dealing with angles, which can be expressed in degrees (
) or radians (
).
Now, before making the conversions we have to know the equivalence between degrees and radians:

Taking this information into account, let's begin with the answers:
a) 
b) 
c) 
d) 
Could you give more of the question?
First 168 is with the discount
The tax is 11.76
168+ 11.76 is 179.76