Answer:
30 dollars.
Step-by-step explanation:
30 dollars because you need to subtract so 40-10 would give you the answer of 30 dollars.
Answer:
The third option
Step-by-step explanation:
It perfectly represents -24/3.
The process is:
C = 2nr
2nr = c
r (2n) = c

That's the answer☝️☝️☝️☝️
or maybe this one
r = 2n + c
sorry, I'm unsure, it has been too long since I studied that...