Answer: the answer is 4, just 4
If you can you should go to a friends house for a while until you feel like it’s safe to go back
F(-1) = -11
f(0) = -9
f(3) = -3
we know that
The formula of the surface area of the cone is equal to

where
SA is the surface area
r is the radius of the cone
l is the slant height
in this problem we have

Solve the formula for l

substitute the values

therefore
<u>the answer is</u>
The slant height is 