Video help added for Excessive use of screens can result in vision problems, obesity, sleep

We added video help to Excessive use of screens can result in vision problems, obesity, sleep for students who need to see the step move, not just read it.

Why this matters

Some doubts are not about the final answer. They are about the transition: why this line became the next line, why a formula was chosen, or why a shortcut is allowed.

What to do now

• Read the written solution first.
• Watch the video only where the step feels unclear.
• Try the same question again without pausing.

Use the video as a repair tool: watch the confusing part, then come back to solving.