Lots!! - take a look http://www.helicopterpilotjobs.co.uk/index.aspx
The military, private owners, and that's about it
Most helicopters use as transportation, some are use for combat.
A large number of jobs use algebra, for instance; Anything involving computer programming or coding (this is surprisingly high) a solid understanding of how to manipulate mathematics is needed to...
An accountant uses math to add, divide, multiply, and subtract to balance bank accounts and other stuff too.
Be more spacific with your question,cause its pretty vegue right now.