As far as I can simplify it - $$4\sqrt{7*4} + 3\sqrt{7} = 8\sqrt{7} + 3 \sqrt{7} = \sqrt{7} * 11$$
However , The options for the correct answer are -
A) $ 8/3$
B) $ 16/3$
C) $ 18/3$
D) $24/3$
I am a ninth grader so please try to explain in simple terms .
I think there was a misprint , most probably they meant - $$\dfrac{4\sqrt{28}} {3\sqrt{7}} = \dfrac{8\sqrt{7}} {3\sqrt{7}} = \dfrac83 $$
In this case , the answer would be A) 8/3