**Two to the second power is equal to four.** This is an example of powers and exponents used in algebra. The expression written in numerical terms is 2^2, which represents two raised to the second power.

In the expression, the first two is the base, and the second two is the exponent or power. Another name for an exponent is the index number. In algebra, the exponent is written as a small number in the given expression to the right and above the base number.

Another way to express this power is to write it as 2 x 2, which represents a repeated multiplication process. The exponent or power indicates how many times to use the base number in multiplication. For example, 10 to the third power, or 10^3 indicates that one multiple the base 10 three times, or 10 x 10 x 10. The answer for this expression is 1,000.