when people say " in lowest terms" they usually mean like the simplified version of an answer
an example of this would be like
make
into lowest terms
the answer would be 
if you dont understand comment on this and ill try to break it down more
If we divide 12.6/4.5 by 3 we receive 4.2/1.5. So yes they are proportional. <span />
√99 is an irrational number
If you draw the line you will see 2/3 is closer to 3/4
A seven is a prime number because you can't divide it. 33 is a composite number because three can go into 33.