Answer:
See explanation
Step-by-step explanation:
The surface area of the solid generated by revolving the region bounded by the graphs can be calculated using formula

If
then

and

Therefore,

Apply substitution

Then

Now

Hence,

20% is what you won't pay therefore 80% is what you'll pay.=80/100*220=$176
Answer:
The directrix is y=6 and focus is (0,4)
The equation of the parabola is,
20-4y=x²