A: -5/18
B:1 and 16/35
C: 7/30
D: 7/8
Answer: Option A.
Step-by-step explanation:
You need to use this formula for calculate the surface area of the right cylinder:

Where "r" is the radius and "h" is the height.
You can identify in the figure that:

Knowing this, you can substitute these values into the formula
, therefore you get that the surface area of this right cylinder is:


Answer:36
Step-by-step explanation: since a square has 4 sides you divide 24 by 4 to see what one side equals which is 6 then you do 6 times 6 because that's how you find area of a square which gets you 36
Combine like terms: 18a - 8b -1
Secant is the same as 1/cos so you can just write it as 1/2pi then you can put that into your calculator as 1/cos(2pi) and it equals 1.