Solving a problem

A problem's screen has the statement on one side and your answer on the other. If the problem has a simulation, the scene shows up too.

The scene

It's an animation that illustrates the statement. You can play and pause it, drag the timeline to a specific moment, and change the speed between 0.5x, 1x, 2x and 4x. Formulas are drawn over the scene and update as it runs.

The sources

When the problem came from your books or the web, the statement carries [1], [2] markers and a Sources list below. Hover over one to see the quoted fragment; if it's a Theca book, the link takes you to the exact page.

Answering

Depending on the problem type you'll type a number, pick options, write a text or work step by step. You have two buttons:

• Run all tests checks your answer against the cases without recording the attempt. Shortcut: Ctrl + '.
• Submit records the attempt and returns the grading. Shortcut: Ctrl + Enter.

The Submissions tab keeps all your previous attempts with their result and feedback.

Hints

If you get stuck, open Hints and click Generate hints. SimuLab builds a concept map on three levels — Foundation, Concept and Application — and you can pan it and click any node to read its explanation. Hints guide you without revealing the answer.