Trouble with DC Circuits? Get Help Here!

[cvc121]

Homework Statement

Hi,
I am having some trouble with DC circuits, especially those that include a combination of series and parallel circuits (networks). There are a couple of problems that I have worked through, but have no idea if I am on the right track and have the correct answers. My work is attached below (the last two attachments are together (question+answer)). Thanks! All help is very much appreciated!

Homework Equations

The Attempt at a Solution

 

[mfb]

The approach is right, I didn't check all numbers in the second problem statement but that is something a calculator can do better anyway.
It would have been easier to follow with the calculations written here in the thread.