<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.5/jquery.min.js"></script>

<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js" type="text/javascript"></script>

<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>

<script src="https://code.jquery.com/jquery-1.9.1.js"></script>
<script src="path-para-seu-script"></script>

You should put the references to the jquery scripts first.
<script src="jquery-3.5.1.js"></script>
<script type="text/javascript" src="script.js"></script>

jQuery must be loaded first before your script.
example:
<script src="path/to/jquery.js"></script> <!-- or using CDN is up to you -->
<script type="text/javascript">	// your script here...
</script>

<script src="//ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>

//If you get a javascript reference error, It means that your using a word that
//needs to be defined. For example, If I wrote "cookie += 1;", I would get this
//error because cookie isn't defined. If you want to define something, you need
//to create a variable that defines "cookie". You could do this:
let cookie = 0;
//Basically, your giving "cookie" a value, so that whenever you write "cookie"
//it refers to "0". Here is another example:
const Discord = require("discord.js");
//This means that "Discord" will now reffer to the discord.js extension.

put <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.4.0/jquery.min.js"></script>
before <script src="script.js"></script>

<script src="http://code.jquery.com/jquery-1.10.2.js"></script>
<script src="http://code.jquery.com/ui/1.11.2/jquery-ui.js"></script>
<script src="http://maxcdn.bootstrapcdn.com/bootstrap/3.2.0/js/bootstrap.min.js"></script>
<script src="exponential.js"></script>