Which equation is correct regarding the measure of angle MNP ?
A
m angle MNP is equal to 1 half times open paren x plus y close parenB
m angle MNP is equal to 1 half times open paren z plus y close parenC
m angle MNP is equal to 1 half times open paren x minus y close parenD
m angle MNP is equal to 1 half times open paren z minus y close paren