It's dependent on the context. A book may ask you to find the f'(x) of a function and you may have to use a u sub in your problem which requires you to find the dy/dx of what you substitute. So in this case both would be used.
Answer:
4
Step-by-step explanation:
;)
Answer:
I think it would be c 160
Step-by-step explanation:
Answer:
The same amount
Step-by-step explanation:
Because its Borrowed money you cant just go around spending unlimited money with out paying the bank back it would not be fair.