<span>c. limestone...............................</span>
Answer:
I think it might be the third one... but I'm not sure.
Explanation:
I think k represents gravity because it's the string keeping the ball attached to the pole.
The altitude and climate change
By rename do you mean turn into an improper fraction?
if so, it is because without turning it into an improper fraction, you cannot subtract 3/4 from 1/4 because you would get a negative answer and that would be incorrect