Instructions
How to embed calculators from Desmos:
Go to https://www.desmos.com (no log in required)
Click "Four Function" or "Scientific" on the front page to select a calculator
Go to https://www.iframe-generator.com/ and paste the URL into the iFrameURL box
Click "Generate" and then click the "Copy It" button:

6. Paste the code into the Embed field in your formative!
How to embed activities from Desmos:
Go to https://www.desmos.com
Click "Classroom Activities" near the top right of the page
Select an activity you like and click "Create Class Code" to run the activity with your students
Click on the class code to launch your teacher dashboard. A window will pop up with a student link. Copy the link:

5. Go to https://www.iframe-generator.com/ and paste the link into the iFrameURL box
6. Click "Generate" and then click the "Copy It" button
7. Paste the code into the Embed field in your formative!