The LCM of 4,10 and 12 is 60.

Since it can be expressed as fraction, it's a rational number.
It is a supplementary angle. D because the add up to 180.
I think you can solve it by
=(x^2 - y^2) *( x^2 + y^2)
= (x -y)*(x+y)*(x^2 + y^2)
Answer:
3.2 in fraction form is 3 1/5
if the . is a multiplication sign then it is 6