Answer:
(a)
(b) 
Step-by-step explanation:
It is given that
.
(a)
(b)
![[\because \sin x=\dfrac{1}{\csc x}]](https://tex.z-dn.net/?f=%5B%5Cbecause%20%5Csin%20x%3D%5Cdfrac%7B1%7D%7B%5Ccsc%20x%7D%5D)

Therefore,
.
I think you need to pit in a graph or draw one yourself, eat mile lable that you ran 100 miles and keep going
Answer:
$25
Step-by-step explanation:
b= 45
x= number of hours
y= amount charged