Issues with fabs pow and sqrt functions

I've been writing code for my computer science class and whenever I use the functions fabs, pow, or sqrt in my code it gives me the error

"'void*' is not a pointer-to-object type"

When i take out the fabs, sqrt, or pow the code then compiles and runs. What do I have to do to get the functions to work?

Edit: Just to add I definitely have the appropriate headers which include these functions
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Please post a minimal example (10 lines or less complete program) that reproduces your problem.
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