In Exercises 15–26, use graphs to find each set. [3, ∞) ⋃ (6, ∞)

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Understand the problem: You are asked to find the union of two intervals, \([3, \infty)\) and \((6, \infty)\), using graphs. The union means all values that belong to either interval or both.

Graph the first interval \([3, \infty)\) on a number line. This includes all numbers starting at 3 (including 3) and extending to positive infinity. Represent this with a solid dot at 3 and a ray extending to the right.

Graph the second interval \((6, \infty)\) on the same number line. This includes all numbers greater than 6 but not including 6. Represent this with an open dot at 6 and a ray extending to the right.

Identify the union of these two intervals on the graph. Since \([3, \infty)\) already includes all numbers from 3 onwards, and \((6, \infty)\) is a subset of that starting from 6, the union will cover all numbers starting at 3 and going to infinity.

Write the union interval notation based on the graph: it will be \([3, \infty)\) because this interval already contains all elements of both sets.

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Interval Notation

Interval notation is a way to represent sets of real numbers using brackets and parentheses. Square brackets [ ] include the endpoint, while parentheses ( ) exclude it. For example, [3, ∞) includes all numbers from 3 to infinity, including 3.

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Interval Notation

Union of Sets

The union of two sets combines all elements from both sets without duplication. In interval notation, the union symbol (∪) merges intervals, so [3, ∞) ∪ (6, ∞) includes all numbers from 3 onwards, considering overlaps.

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Finding the Domain and Range of a Graph

Graphing Intervals on the Number Line

Graphing intervals involves shading regions on a number line to represent sets of numbers. Closed dots indicate included endpoints, open dots indicate excluded endpoints, and shading shows all numbers within the interval, helping visualize unions and intersections.

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