Hello!
To find the surface area of a cylinder you use the equation

SA is surface area
r is radius
h is height
PUt in the values you know

Square the number

Multiply 7 and 18

Multiply 126 by 2

Multiply the 49 by 2

Add

The answer is

Hope this helps!
I believe the line shows in XZ because the line segment extends through and past points X and Z :)
5 feet 5 inches is the same as 65 inches, so LAMAR is taller.
Because the account is compounded continuously, Euler number is required
e = 2.7182818