incompatible units

How about this

Mike

As a further note, to get Prime to display anything other than the base units (eg, microfarads rather than farads), you have to delete the whole of the displayed units before typing in the unit you want (and the simplest way to do this is to press the End key, then Backspace; this will select the units.  Then either press Backspace again to delete them or just start typing your new units).

Stuart

Unfortunately I can't read your file as my Prime 3 can't open files in 3.1 format.

But you were already told that the second assignment, where you did not use any units, was the reason for your problem.

I guess this assignment was done for documentation reasons and you might consider using the symbolic evaluation with the keyword "explicit" instead.

I have redone the first assignment in Mathcad 15 but it should work the same in Prime:

In Mathcad we also have the option to hide the keywords and to change the arrow for an equal sign, so it looks like this

Unfortunately these options are not available in Prime, being just a subset of Mathcad15.

You can also use the assignment directly followed by the symbolic evaluation with explicit in one line.

Again, the second display is not available in Prime (you could also let the := being displayed as a normal 😃

Also bear in mind, that "explicit" works fine in this example, but its use is limited and it may not always give you the display you have in mind.

But all the other alternatives, like writing the expression a second time using the boolean equal sign just for documentation or disabling the second assignment have the huge drawback, that the documentation doesn't really show the actual calculation. You could change the value of C.1 and if you don't update your doc, its showing the wrong values.

Werner