Euler's Method for Cooling?

[Jclem23]

[FONT=arial, helvetica, sans-serif]I am struggling with this table. I do not understand the differences between dt=5 and dt=1. Here is a link to the course lesson for more info.
[/FONT]https://www.math.ncsu.edu/courses/MA132/ma132.7.html

Time (minutes)	Temperature Euler's Method (dt = 5)	Temperature Euler's Method (dt = 1)	Temperature Exact Solution
5	°	°	°
20	°	°	°
30	°	°	°
60	°	°	°

 

[stapel]

I am struggling with this table. I do not understand the differences between dt=5 and dt=1. Here is a link to the course lesson for more info.
https://www.math.ncsu.edu/courses/MA132/ma132.7.html

Time (minutes)	Temperature Euler's Method (dt = 5)	Temperature Euler's Method (dt = 1)	Temperature Exact Solution
5	°	°	°
20	°	°	°
30	°	°	°
60	°	°	°

The link requires a username and password, and I have zero idea what is going on in this "table".

Please reply with the full and exact text of the exercise (typing it out yourself, since the copy-n-paste isn't working), the complete instructions, and a clear listing of your thoughts and efforts so far. Thank you!