25÷100=0.25
0.25×680=170 is the answer
the initial statement is:

and then:

So the second statement is false because f should be multiply by e, not by d so is option C)
Answer:

Step-by-step explanation:
The formula of a surface area of a sphere:

R - radius
We have

Substitute and solve for R:
<em>divide both sides by π</em>
<em>divide both sides by 4</em>

The formula of a volume of a sphere:

Substitute:

Answer:
C
Step-by-step explanation: