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Add $n$ numbers and divide the result by $n$.

When three real numbers are multiplied, it makes no difference which two are multiplied first.

When three real numbers are added, it makes no difference which two are added first.

A formula used to find the area of geometric objects or figures. Area is measured in square units.

The symbol $\,\approx\,$ represents an answer that is rounded to a specified number of decimal places.

If $a$, $b$, $c$, and $d$ are integers with $b\ne 0$ and $d\ne 0$, then $\,\displaystyle{a\over b}-{c\over d}={{ad-bc}\over{bd}}$.

If $a$, $b$, $c$, and $d$ are integers with $b\ne 0$ and $d\ne 0$, then $\,\displaystyle{a\over b}+{c\over d}={{ad+bc}\over{bd}}$.

An inequality that contains one or more variable terms.

A collection of variables and constants combined by using addition, subtraction, multiplication, or division.

Uses an equal sign to set two algebraic expressions equal to each other and is true for only certain values of the variable.

The sum of a real number and its opposite is zero.

Two numbers whose sum is zero.

The sum of zero and a real number equals the number itself.

Add the same quantity to each side.

Rewrite the fractions so that they have like denominators. Then use the rule for adding fractions with like denominators.

Let $a$, $b$, and $c$ be integers with $c\ne0$. Then use the following rule: $\displaystyle{a\over c}+{b\over c}={{a+b}\over{c}}$

Find the absolute value of each integer. Subtract the lesser absolute value from the greater absolute value and attach the sign of the integer with the greater absolute value.

Add their absolute values and attach the common sign to the result.

A number where the sum of its proper factors is greater than the number.

The distance between any real number and 0 on the real number line.