Why did Jean get an error when he tried to use the variable my Grade? Variables should be one word. Variables should start with a number. Variables should always be camelcase. Variables should not have spaces.

Variables should not have spaces

Explanation:

When you have a multi-word variable, it is convention to leave the first word lowecase  and make the first letter of the next words capital. However, mostly every programming language does not allow primitive variables with spaces.

ex: myWordVariable = 5