Question

find the following using appropriate properties of addition

Answer 1

may it help you Angelina

Answer 2

Answer:

$\frac{3}{7} + \frac{4}{9} + ( \frac{ - 5}{21} ) + \frac{2}{3} \\ = \frac{3}{7} + \frac{4}{9} - \frac{5}{21} + \frac{2}{3}$

Taking L.C.M of 7,9,21 and 3

We have 63 as L.C.M

$= \frac{27 + 28 - 15 + 42}{63} \\ = \frac{82}{63}$

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