How many pics will a 16gb SD card hold?

I have a Nikon camera and it's 20.2 megapixels. How many photos will it hold?

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What can be the problem?

I put the film and it's not working, i think i put it well. Can be another problem than
the film?

2- When we put film can we press one time without make a picture?

3- What to see buying a camera?

4-What's a good camera? Must the computer be adapted to it?

5- What's a good camercord and cell phone?
Added (1). We cant press the buton tovtake a photo, it's hard.

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Why is the monitor displaying bad blurry photos on my DSLR camera?

I understand that a lot more goes into play (balancing the shutter speed, ISO, and aperture), but what I don't understand is why every photo displays blurry on the monitor no matter how many settings I change.

I am completely new to cameras. Just picked up my first one - a Nikon d3100. I love it so far but what's up with the blurry monitor display after I take a picture?

Is that just how monitors display pictures typically and I am simply overreacting?

Thanks for the help!

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