I think the answer is 152 but I’m not 100% sure
The value of the function is -20
Answer:
The answer is 
Step-by-step explanation:
Assuming the snowball is a perfect sphere, then if A denotes the surface area and D the diameter then:

Differentiating wrt r we have:

We are told that
and we want to find 
By the chain rule we have:

∴
∴
When D=10 then

The sign (-) shows that the D is decreasing.
The answer would be 18mm because 6+6+3+3 considering that there are 4 sides.