A cardiac monitor is used to measure the heart rate of a patient after surgery It compiles the number of heartbeats after t minutes When the data in the table are graphed the slope of the tangent line represents the heart rate in beats per minute The monitor estimates this value by calculating the slope of a secant line Use the data to estimate the patient s heart rate after 42 minutes using the secant line between the points with the given values of t Round your answers to the nearest hundredth a t 36 and t 42 b t 38 and t 42 c t 40 and t 42 d t 42 and t 44 What are your conclusions t min 36 38 40 42 44 Heartbeats 2530 2661 2806 2948 3080 a b c d