Answer:
f'(x) = 
Step-by-step explanation:
i) f(x) = 9 / x
ii) f'(x) = 

It's B because 5 x 4 = 20 and 9 x 5 = 45
When you add them together you get 65
Answer:
Your answer is $24
Step-by-step explanation:
5*4 is 20, so all that you have to do it 6*4
4x = x + 90
-x -x
3x = 90
/3 /3
x = 30
The answer is A) 30