Clearing up acronyms

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When it comes to amiga I hear lots of acronyms. For instance, I was looking at an accelerator card which included the letters FPU - now, I have heard of CPU, GPU, PPU etc etc... but not FPU

What is (an) FPU? And, does it come with an accelerator card (where I am right in saying the A Card also potentially includes memory as well as increased Proc' speed)

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ok. so i have a standard A1200 (with the HDD however) with a 68k20 - on my mobo do i have a FPU now?

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-so these accelerator cards: they include more memory (even have spaces to add more memory)?.

-they can (or DO) include an FPU?

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so its possible to get an Accelerator card with:

1. A Memory Upgrade?

2. A CPU Upgrade?

3. An FPU Upgrage

4. If this is true, what happens to the CURRENT CPU in the MB?

5. The memory on the Accelerator card is now Grphics mem in WB?

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i think Durons have a cache which goes down to 64Kb

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.lha (files)

is this an Amiga program compressed file?

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is there a dloadable program FOR the amiga which will uncompress these files (on the amiga) for me?

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DiskMaster seems only to deal with LHA i need LZX ... ?

any program for that?