Question

The sets C and D are defined as follows:
C={v|v=>3}
D={v|v>9}

Write C intersection (upside down u) D and C U D using interval notation.
also, indicate if the set is empty

Answer 1

you can graph it, if you find difficulty.

Answer 2

Here's the graph.
C={v|v=>3}

D={v|v>9}