Which element is in W={x: x is a natural number and x+4=9}?
Answer and explanation
Correct answer: 5
The governing concept is finding a set member by solving its defining equation and checking the domain. From x+4=9, subtract 4 from both sides to obtain x=5. Since 5 is a natural number, it satisfies both conditions and belongs to W. The numbers 4, 9, and 13 do not solve the equation x+4=9, so they cannot be members of this set.
Frequently asked questions
What is the correct answer to this question?
5
Why is this the correct answer?
The governing concept is finding a set member by solving its defining equation and checking the domain. From x+4=9, subtract 4 from both sides to obtain x=5. Since 5 is a natural number, it satisfies both conditions and belongs to W. The numbers 4, 9, and 13 do not solve the equation x+4=9, so they cannot be members of this set.
Which subject and chapter does this question cover?
This is a Class 9 Mathematics question. Chapter: Number Systems.
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