ترجم للانقلش: محور y يمثل h ونالحظ ان االرتفاع يقل مع زيادة الزمن النه قطع مكافئ مفتوح ألسفل وبما ان االرتفاع يقل بزيادة الزمن فيعني ان : التزايد [420√ 0,] ∋ �� وهو عند راس القطع المكافئ التناقص (420√ 0,]

Here is the English translation of your text:

"The y-axis represents h, and we notice that the height decreases as time increases, which means it is a downward-opening parabola. Since the height decreases with increasing time, it means that the interval of increase is [0, √420], and it is at the vertex of the parabola. The interval of decrease is (√420, 0]."

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Here are 5 questions related to the concept of parabolas and intervals of increase and decrease:
1. What is the general equation for a parabola, and how do you identify its vertex?
2. How can you determine whether a parabola opens upwards or downwards?
3. How is the interval of increase and decrease determined for a quadratic function?
4. How does the vertex of a parabola relate to the intervals of increase and decrease?
5. What are real-world applications where parabolas and their properties are used?

**Tip:** The vertex of a parabola is the turning point where the function transitions from increasing to decreasing (or vice versa).

Explore how the height of a parabola decreases over time in a downward-opening parabola. This detailed explanation covers quadratic functions, vertex calculation, and intervals of increase and decrease, suitable for Grades 9-12.

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