A Cardiac Monitor Is Used to Measure the Heart Rate $t$

question 95

Multiple Choice

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 $t = 38$ and $t = 42$ .
$\begin{array}{|c|c|c|c|c|c|}\hline t \text { (mins) } & 36 & 38 & 40 & 42 & 44 \\\hline \text { Heartbeats } & 2570 & 2720 & 2840 & 3020 & 3070 \\\hline\end{array}$

• A) 74
• B) 80
• C) 85
• D) 70
• E) 76
• F) 75

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Definitions:

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Arachnid

Group of arthropods that includes spiders and scorpions.

Cephalothorax

A body region found in arachnids and some crustaceans, where the head and thorax are fused into one unit.

Book Gills

Respiratory organs found in horseshoe crabs and some arachnids, consisting of leaf-like structures stacked on top of each other.