Multiplying rational expressions is basically two simplifying problems put together. When multiplying rationals, factor both numerators and denominators and identify equivalents of one to cancel. Dividing rational expressions is the same as multiplying with one additional step: we take the reciprocal of the second fraction and change the division to multiplication.
When you're talking abut describing a data set often times we use a difference measure of center to describe the data. Sometimes you might use average or mean, sometimes you might use median, other times you may use mode. Mode of a data set is the value that shows up most often. That's how I remember it, mode sounds a lot like most, I don't know it helps me remember that the mode is the value that shows up most often. Couple of things to keep in mind sometimes there's more than one mode. It might be two or three values that show up in equal number of times. And if it were the most times that would be the mode. Also mode is often used to describe non-numeric data. Like if you're talking about something like gender or eye color or something often with bar graphs you're asked to find the mode or the value that shows up most often. It will become more clear once you start doing problems and these one aren't too difficult guys you can do it.
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