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How is voltage measured in a voltmeter, is it the difference between the voltages that are measured. If you can, please explain how to do part B of the question.(I am trying to solve this question and it would be easier if I knew this)the question I am referring to Thanks. =)

ND-BEAST
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    your course instructor should be made aware that some of the students do not know how a voltmeter operates .... that should have been one of the first things that was taught – jsotola Nov 06 '18 at 23:37

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Yes, as the name suggests, a volt-meter will measure the difference in voltage between its two terminals.

You can assume that the voltmeter has infinite resistance and doesn't load the circuit in any way.

As this is a homework question we need you to show your work and where you are stuck.

Transistor
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    The (or maybe a) meta-answer is that all voltages are differences. There is no absolute "zero volts" -- only differences in voltage between point A and point B. So there's nothing that a voltmeter can do other than measure the difference between two points. (Well, it could burn up when you turn it on -- there's nothing that a correctly operating voltmeter can do, etc.) – TimWescott Nov 06 '18 at 22:46
  • In addition to @TimWescott's comment, replacing "difference in voltage" with "difference in potential" would be more correct, and I think it's important to stress the subtle difference between the two. – Sean M Nov 08 '18 at 05:46
  • Thanks guys for the comment. It helped me understand more clearly. =) =) =) =) =) =) =) =) =) =) – ND-BEAST Nov 08 '18 at 17:33
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If I answer your homework question will I get in trouble? The 500 and the 1K are in series and form a voltage divider. Calculate the voltage at the center with respect to (for example) the right side power line.
The 1K and the 3K also form a voltage divider. Calculate that center voltage with respect to the same power line. The voltmeter as shown will read the difference between the 2 center point voltages.
The answer is .:.:.:.:. ! (dragon boat)

John Canon
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