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Veniogenesis

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I've tried searching over and over again in my textbook and online, but I can't seem to find anything about the specific nature of parallel batteries.

So I have the following problem that I can't get anywhere with:

There is a 6 ohms light bulb connected to two 1.5 V batteries that are in parrallel. Each battery has an internal resistance of 0.5 ohms.

1. What is the current through the bulb? (No idea on the formula. )

2. What is the terminal voltage across each battery? (No idea. )

3. What is the power consumption of the bulb? (I'm guessing after finding the current, the power consumption will just be I^2*R?)

4. By what factor have you shortened or lengthened the life of the batteries? (All I know is that the life is lengthened, but I have no idea what the formula is.)

Thanks sooo much everyone for helping out!