Answer:
a. 20
Step-by-step explanation:
just multiply 5 and $4 by 4
Answer: C
Step-by-step explanation:
To find the surface area of a cone, you use the formula
. Since we are already given the height and radius, all we have to do is plug in the values and solve.
[solve inside of square root]
[parenthesis]
[multiply]

Therefore, the closest answer is C.
The answers to the questions