Fixed typos and added a reference. (#27435)

* Fixed typos and added a reference.

* fix: removed the word that

guide/english/mathematics/exponents/index.md

@@ -2,7 +2,8 @@
 title: Exponents
 ---
 ## Exponents                                                           
-An exponent is shorthand for the the number of times a number is multiplied by itself.  It is often denoted with a superscript, karat, or with "to the power of" such as:
+
+An exponent is shorthand for the number of times a number is multipled by itself.  It is typically denoted with a superscript, karat, or with "to the power of" such as:
 
 - 2<sup>3</sup>
 - 2^3
@@ -16,20 +17,23 @@ The general format of writing an exponent is:
 - base<sup># of times you multiply base by itself</sup>
 
 Common exponents have special names:
-- Exponent of 2 is often referred to as squared.  So 3<sup>2</sup> is referred to as 3 squared, evaluating to 9.
-- Exponent of 3 is often referred to as cubed.  So 2<sup>3</sup> is referred to as 3 cubed, evaluating to 8.
+- An exponent of 2 means the number is squared.  So 3<sup>2</sup> is referred to as 3 squared, evaluating to 9.
+- An exponent of 3 means the number is cubed.  So 2<sup>3</sup> is referred to as 2 cubed, evaluating to 8.
 
 ### Negative Exponents
 Negative exponents are computed similarly, except the value is placed as a denominator beneath a numerator of 1.
 
-For example, 2<sup>-2</sup> = 1/(2*2) = 1/4
+For example, 2<sup>-2</sup> = <sup>1</sup>/<sub>(2 * 2)</sub> = <sup>1</sup>/<sub>4</sub>
 
 ### More Examples 
-2<sup>5</sup>  = 2*2*2*2*2 = 32
+2<sup>5</sup> = 2 * 2 * 2 * 2 * 2 = 32
 
--2<sup>5</sup>  = -2*-2*-2*-2*-2 = 32
+(-2)<sup>5</sup> = -2 * -2 * -2 * -2 * -2 = -32
 
 10<sup>6</sup> = 1,000,000
 
-2<sup>-5</sup> = 1/(2*2*2*2*2) = 32
+2<sup>-5</sup> = <sup>1</sup>/<sub>(2 * 2 * 2 * 2 * 2)</sub> = <sup>1</sup>/<sub>32</sub>
 
+### More Information:
+
+- [Wikipedia](https://en.wikipedia.org/wiki/Exponentiation)