The height in centimeters of the tip of the minute hand on a vertical clock is a function, $f(t)$, of the time, $t$, in minutes. The minute hand is 22 cm long, and the middle of the clock face is 266 cm above the ground.

(a) The midline of the graph of $f(t)$ is $y =$ (include units: help (units))

(b) The amplitude of the graph of $f(t)$ is (include units: help (units))