9) As a wave passes by, the height of the water is modeled byh(t)=5cos(711t), whereh(t) is the height in feet above mean sea level. Find the height of the wave. (That is, find the vertical distance between the trough and the crest of the wave.)

10) The functionP(t)=10520sin(54t) approximates the blood pressureP, in millimeters of mercury, at timet, of a person at rest. Find the period and the highest blood pressure.