Question

The numerical expression 3/8 + (-5)/7 = -19/56 shows that
(a) rational numbers are closed under addition.
(b) rational numbers are not closed under addition.
(c) rational numbers are closed under multiplication.
(d) addition of rational numbers is not commutative.

Answer 1

hiii. .....friend

the answer is here,

The numerical expression shows that rational numbers are closed under addition.

Option A is correct .

:-)Hope it helps u.

Answer 2

Answer:

(A) rational numbers are closed under addition.

Step-by-step explanation:

The given numerical expression is"

$\frac{3}{8}+\frac{(-5)}{7}=\frac{-19}{56}$

Taking the LHS of the above given expression,

$\frac{3}{8}+\frac{(-5)}{7}=\frac{3}{8}-\frac{5}{7}$

Taking LCM, we get

$\frac{21-40}{56}$

=$\frac{-19}{56}$=RHS

Therefore, The rational numbers are closed under addition.