Question

why t'f do we have to "know" all this math stuff.

Answer 1

its helps us in life

Answer 2

to keep your math teacher off the unemployment line

Answer 3

And to keep you off the streets.

Answer 4

You don't have to know it, but it helps you gain an edge over the competition. An employer is more likely to hire someone who knows their math over someone who doesn't have a clue. Plus you won't be taken advantage of when it comes to money if you know your math. Those are just two of many examples of why math is important.