Combine like terms-- you can combine the k's:
Now you have:
Simply divide both sides by 2.5 to find the value of k:
Answer:
I think it's the 3rd or fourth one. I'm not positive tho
Answer:
10 in
Step-by-step explanation:
So we want to consider the surface area of this sphere.
The formula for surface area of a sphere is .
So we have that the surface area is .
So I'm going to replace in with .
Now our main objective here is to solve for :
Divide both sides by :
This gets us by itself:
What number squared gives you 25? If you don't know, just take the square root of both sides giving you:
Now you can just put in your calculator. You should get 5.
5 is the radius
The diameter is twice the radius.
So 2(5) is 10, so the diameter is 10 in.
36.5 I think, I'm not sure tho