D and E are sets of real numbers defined as follows. D= {x | x< 1} E = {x | x≤8} Write DnE and DUE using interval notation. If the set is empty, write ø.

Answer 1

D Union E = DUE = DvE =when x is in D or x is in E =

(-infinity, 8] in interval notation when x < 8

D intersection E = D^E = when x is in both D and E =

(-infinity, 1) in interval notation when when x < 1

the intersection symbol is either ^ or an upside down U, which might be n as the closest on some keyboards

the Union symbol is either U or v