Which of the following are rational numbers and which are not?
4-415×(-2)
A rational number is defined as a number that can be expressed in the form pq where p (numerator) and q (denominator) are integers (q≠0).
So, 4-415×(-2)=0-30 , here p=0 and q=-30.
Hence, 4-415×(-2) is a rational number.
Question 4 Which of the following is not true? (a) rational numbers are closed under addition. (b) rational numbers are closed under subtraction. (c) rational numbers are closed under multiplication. (d) rational numbers are closed under division.
-134-4
45
-5
0