Question

sqrt of 7/9 times the sqrt of 4/7

Answer 1

when you have sqrt(x) times sqrt(y) you can combine them to be sqrt(xy)
in this problem, you can multiply 7/9 by 4/7 to get 4/9
then, since its in a square root, take the square root of the top and the square root of the bottom, and you get 2/3