Here's the question:

Carline has 750$ in the bank. Every week, she takes out at least $20.

A. Make an inequality that shows the amount of money Caroline has in the bank, B, based on the number of weeks, w, that she takes money out.

Her answer is b is less then or equal to 750-20w

I don't get how she got the less then or equal to or the B.

Please Help!!!!

And another inequality problem;

In a problem like 4|3-2x| +1 is less then or equal to 21

how do you know if when you do your solution if it's a or or a compound inequality?