$ in functions

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Hello,

I am still new to excel and I am working on a project. I have been
looking all over the net to try and find out what the $ in a function
means. For example, =PPMT($E$6/12,$B$15,$E$8,-$B$6) and =IPMT($E
$6/12,$B$15,$E$8,-$B$6). Please someone help!!

Thanks,

Kayla

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