So we are given the expression:
÷ 
When we divide fractions, we must flip the second term and change the sign to multiplication:

And then we multiply across:

Then we can break apart all of the like variables for simplification:

When we simplify variables through division, we subtract the exponent of the numerator from the exponent of the denominator. So we then have:



So then we multiply all of these simplified parts together:

So now we know that the simplified form of the initial expression is:
.
i m not sure about the answer ...
In order to find the number of hours it takes to do the full rotation we separate into pieces the days, hours, and minutes and convert each of them separately.
using the conversion factor from days to hours we get that

then we get that

hours does not need a conversion factor, meaning that

continue by converting the minutes using the following conversion factor

then,

To complete add all the results together

It takes mercury 922.5 hours to complete a full rotation.
Simplify the radical by breaking up the radicand into a product of known factors.

Answer:
2lw + 2lh+2hw
Step-by-step explanation: