## Summary: Review

Key Concepts

• Denominators may be eliminated from rational equations by multiplying each term in the equation by the lowest common denominator (LCD).
• Declare values of the variable that could cause any denominator to equal zero before reducing or solving, then exclude those values from the solution set for the equation.
• The formula for the perimeter of a rectangle of length L and width W is $P=2L + 2W$
• The formula for the area of a rectangular region of legth L and width W is $A=LW$
• The formula for the volume of a rectangular solid of length L, width W, and height H is $V = LWH$
• The formula that relates distance, rate, and time is $d = rt$
• A formula may be rearranged by algebraically isolating any one of the variables as desired
• Inequalities may be expressed in words, by using an inequality symbol, or graphed on a number line.

## Glossary

area
the size of the surface of a two-dimensional figure
inequality
a mathematical statement that compares the size or value of two mathematical expressions
LCD
lowest common denominator, the smallest possible expression into which each denominator will factor evenly.
perimeter
a measure of the linear distance around the edges of a two-dimensional figure
rational equation
any equation containing a variable expression in one or more denominators
volume
the size of the space contained within the edges of a three-dimensional figure