Answer:
The first one
Step-by-step explanation:



Stationary points occur where the derivative is zero. The denominator is positive for all

, so we only need to worry about the numerator.


for all

, so we can divide through:

But

for all

, so this function has no stationary points...
I suspect there may be a typo in the question.
(5/8):(1/4)= 5/8 • 4= 20/8=5/2 = 2 and 1/2
170 . 10 millimeters make up 1cm so multiple 17x10