Always, sometimes or never true?

Is this statement ALWAYS, SOMETIMES or NEVER true? Give a reason. "Multiplying a number by 6 makes it bigger."

Is this statement ALWAYS, SOMETIMES or NEVER true? Give a reason. "5x is even for every whole number x."

Is this statement ALWAYS, SOMETIMES or NEVER true? Give a reason. "The angles on a straight line add up to 180°."

Is this statement ALWAYS, SOMETIMES or NEVER true? Give a reason. "Adding 14 to every value in a data set leaves the range unchanged."

Is this statement ALWAYS, SOMETIMES or NEVER true? Give a reason. "A multiple of 6 is also a multiple of 4."

Is this statement ALWAYS, SOMETIMES or NEVER true? Give a reason. "9x is even for every whole number x."

Is this statement ALWAYS, SOMETIMES or NEVER true? Give a reason. "8x is even for every whole number x."

Is this statement ALWAYS, SOMETIMES or NEVER true? Give a reason. "Adding 11 to every value in a data set leaves the range unchanged."

Is this statement ALWAYS, SOMETIMES or NEVER true? Give a reason. "If a coin lands on heads five times in a row, tails is more likely on the next flip."

Is this statement ALWAYS, SOMETIMES or NEVER true? Give a reason. "For any whole number x, $x^{2}+x$ is even."

Is this statement ALWAYS, SOMETIMES or NEVER true? Give a reason. "The mean of a data set is bigger than its median."

Is this statement ALWAYS, SOMETIMES or NEVER true? Give a reason. "A number and its opposite add up to zero."