Question

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Answer 1

1. Rational

2. Irrational

3. RCZCWCN

4. Factors are:

12: 1, 2, 3, 4, 6, 12

15: 1, 3, 5, 15

21: 1, 3, 7, 21  

The only common factors are 1 and 3, and since 3 is greater than 1 then 3 is the highest common factor.

Ans 3

Hope It Helps !!!!!!

Answer 2

Answer:

1) RATIONAL(B)

2) IRRATIONAL(C)

3)N∈W∈Z∈R(A)

4) 3(B)

Step-by-step explanation:

1)IT IS THE DIRECT THEORY. a rational number is a number that can be expressed as the quotient or fraction p/q of two integers, a numerator p and a non-zero denominator q.

2)IT IS ALSO THE DIRECT THEORY.An Irrational Number is a real number that cannot be written as a simple fraction. Irrational means not RationaL.

3)This question is easy.In this N represents natural number,W represents whole numbers,Z represents integers,R represents real number. And between these symbols the letter C is given IT MEANS SUBSET .So the natural number belongs to whole numbers and whole numbers belongs to integers and integers belongs to real numbers.I hope it is clear.

4)the hcf of 12,15,21 is 3.TRY DOING THIS