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Question: Noise coming from rear-right tire

Recently the car started making this squeaking noise that seems to be coming from the rear, right tire. It's not always there, it just comes suddenly and disappears suddenly. It's not really loud, but the first time I heard it, it was a little loud. Now it comes and goes randomly, at random volumes.

My car is in need of alignment, and there is also something else going on with it, which started before I began hearing this squeaking noise. Several months ago it started giving this little jolt whenever I would put the gear in reverse. Instead of switching right away, it would pause, then jolt, sometimes a big jolt, sometimes a small one, and then it would switch. Even as I'm driving, it seems sometimes that the car jolts while in drive, but that doesn't happen as often as when I try to put it in reverse.

Are there any safety issues I need to be concerned about here, or would the car just die on me one of these days if I don't take it to a mechanic? I don't have the money currently to spend on repairs, but if there is a safety issue, I will just have to take public transport until I can afford to have it fixed.

Thanks for your input.
Savoera