False.
Because there are three dimensions, not just two dimensions, so two of the sides will not be affected by the changing of one of the dimensions.
9x^2 should be the sqrt(81x^4)
You didn't put any options but any ratio that 4.2:1 doesn't go into is not equivalent.
Hope this helps :)
13.4 = 13.40
This is because the 0 at the end is a trailing decimal, and so when testing for inequalities, you can simply disregard it.
