Question

add the following rational numbers 7 by 9 + 3 by minus 4

Answer 1

Here is your answer

$7 \div 9 + 3 \div ( - 4) \\ = 7 \div 9 - 3 \div 4 \\ =( 28 - 27) \div 36 \\ = 1 \div 36$
1/36 is correct answer

Hope it helps you

Answer 2

7/9+3/-4 (lcm of 9and 4=36)(here 3/-4 changes to -3/4 in standard form)
28-27/36=1/36