A phone company offers a deal by which a long distance phone call costs .99 cents for the first 20 minutes and .07 per minute thereafter. Write a piecewise-defined function for the cost C of making a phone call that lasts x minutes.(adsbygoogle = window.adsbygoogle || []).push({});

So I did this:

f(x) { .99(6) 0<= x

.99(20) 0=> x >= 20

Not a clue what I'm doing...

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Piecewise-defined function

**Physics Forums | Science Articles, Homework Help, Discussion**