When a patient with hypertension takes a particular type of blood pressure medication the effects on the systolic pressure S t can be measured by the following piecewise 0 t 4 140 6t if 116 if 4 t 8 where t is the time in hours since taking the medication Based on the graph of the piecewise function if the patient 96 8t if 8 t 12 defined function S t takes the blood pressure medication at 8 a m in which interval will their systolic pressure be lowest 10 a m to 12 p m 12 p m to 2 p m 04 p m to 6 p m 08 p m to 10 p m