Answer:
![k(-5)=70](https://tex.z-dn.net/?f=k%28-5%29%3D70)
Step-by-step explanation:
The given function is
![k(x)=6x+100](https://tex.z-dn.net/?f=k%28x%29%3D6x%2B100)
To find k(-5), we put x=-5 into the given function to get;
![k(-5)=6(-5)+100](https://tex.z-dn.net/?f=k%28-5%29%3D6%28-5%29%2B100)
Multiply out to obtain;
![k(-5)=-30+100](https://tex.z-dn.net/?f=k%28-5%29%3D-30%2B100)
This is the same as;
![k(-5)=100-30](https://tex.z-dn.net/?f=k%28-5%29%3D100-30)
This simplifies to
![k(-5)=70](https://tex.z-dn.net/?f=k%28-5%29%3D70)
It is 18 because the radius is half the diameter and 9 x 2 = 18.
(A)
Step-by-step explanation:
All other choices will result in a negative number inside the radical sign.