Question

(2 Points)
The numerical expression
- 19 shows that:
+
(?)
56
Rational number is closed under addition
Rational number is not closed under addition
Rational number is closed under multiplication
Addition of ratoinal number is commutiative

Answer 1

Answer:

(a) rational numbers are closed under addition. Because, (3/8) + (-5/7) Take the LCM of the denominators of the given rational numbers. LCM of 8 and 7 is 56 Express each of the given rational numbers with the above LCM as the common denominator. Now, (3/8)= [(3×7)/ (8×7)] = (21/56) (-5/7)= [(-5×8)/ (7×8)] = (-40/56) Then, = (21/56) + (-40/56) … [∵ denominator is same in both the rational numbers] = (21 – 40)/56 = (-19/56)Read more on Sarthaks.com - https://www.sarthaks.com/844655/the-numerical-expression-3-8-5-7-19-56-shows-that