The Purplemath Forums

Okay, our teacher always gives a "little" help with whatever we're learning and then throws homework at us. I'm pretty sure I get the Permutation, but the Combination is so confusing! The problems seem so simple, but I just can't do it. Just to check if I'm doing this right, is this correc...

Thank you so much! I get it now. :thumb: I just have two more question, if you don't mind.. I'm confused between the difference in permutation and combination, and I'm confused what n and r stand for. (The two variables: n C r ) These are three of the word problems I have: 1) Maggie has 8 different ...

-9x - 4 > 50

Well, if I'm not mistaken, -9x - 4 > 50 can be solved like this :



And since you are dividing by a negative number and you're using inequalities, you should flip the sign making it x < -6 or x is less than -6.

Thank you very much. I understand now. :D Note: The exercises you have posted imply that you are expected to be familiar with the above terminology, along with the related concepts and formulas, and also with more-advanced material. I know. I have no nice way to put it, but my teacher isn't all that...