E and F are sets of real numbers defined as follows . E=\ y|y<4\ F=\ y|y>=5\ Write E cap F and E cup F using interval notation. If the set is empty, write emptyset .

Answer 1

union: y<4 or 5 <=y

open circle at 4 shades left and close circle at 5 shades right

yes, the intersection is empty. Can't be less than 4 and greater than 5 at the same time