Contravene most nearly means:

Forces existing in pairs are sometimes called

Good leaders get involved in their subordinates' careers. People merely obey arbitrary commands and orders, but they respond quickly and usually give extra effort for leaders who genuinely care for them. An often neglected leadership principle in today's environment of technology and specialization is knowing the workers and showing sincere interest in their problems, career development, and welfare. Leadership is reflected in the degree of efficiency, productivity, morale, and motivation demonstrated by subordinates.
Leadership involvement is the key ingredient to maximizing worker performance.
A key leadership principle that's often ignored is:

In the figure above, assume the valves are all open. Which valves need to be closed for the tank to fill up completely?

Solve for y: 4(y + 3) + 7 = 3