Pls help I will give u brainlest whoever is first and gets it right!

Angle mno is s rotated 180 degrees counterclockwise about the origin to form angle m’n’o’. which statement shows the measure of angle m’n’o’?

For what values of the variable x is the expression square root of 7x+14+ square root of 7-x a real number?

Yvaries inversely as x. y =12 when x=5. find y when x=4