Josie finds a texting plan that costs a flat fee of $10 per month for 150 texts, plus $.20 per text after that. Which cost function represents this scenario if x equals the number of texts exceeding 150 that Josie sends in a month?

Question

anonymous · Answer

Would you like my answer choices?

pfenn1 · Answer

The plan costs the flat fee plus 0.20 times the number of texts over 150.

anonymous · Answer

@fallingangel Can you give it a try with @pfenn1's instruction?

anonymous · Answer

@Chlorophyll I can try. :/ Is it C(x) = .20 + 150x?

anonymous · Answer

Is that right?

pfenn1 · Answer

No.  What is the flat fee?

anonymous · Answer

$10?

pfenn1 · Answer

yes.  What is the charge per text for every text above 150 texts for the month?

anonymous · Answer

.20

pfenn1 · Answer

Okay you want to write an equation for the total cost, which equals the flat fee plus 0.20 times the number of texts over 150.

pfenn1 · Answer

Remember: x equals the number of texts exceeding 150.

pfenn1 · Answer

I have to run.  Maybe @Chlorophyll can help you if you need more help.

anonymous · Answer

This is the key: 
"The plan costs the flat fee plus 0.20 times the number of texts over 150 "
          Cost =         $10       +      .2      *     ....

anonymous · Answer

* x?

anonymous · Answer

All I do is interpret @pfenn1's instruction, do you see it @fallingangel

anonymous · Answer

Yes :)

anonymous · Answer

Yes. It's C(x) = 10 + .20x, huh?

anonymous · Answer

We hope you learn the concept for your own sake!

anonymous · Answer

Yeah. Thanks.