Answer:
678.2
Step-by-step explanation:
To find the surface area you need to use the expression
When you substitute the numbers in you get 678.24
For 81 it's 8.1 in decimal or which way you need it in?
Simplify the integrand:

Now integrate one term at a time.



Putting everything together,

Answer:
its 24 because the decimal is less than 5