Question

for 10 seconds ariana places her finger on her radial artery and counts her heartbeats. in 10 seconds, she counts 15 beats. what is arianas current heart rate based on this measurement? (1 point) o 115 o 15 o 90 o 25

Explanation:

Step1: Recall heart - rate formula

Heart rate is measured in beats per minute. There are 60 seconds in a minute.

Step2: Calculate heart rate

If there are 15 beats in 10 seconds, and we want to find the number of beats in 60 seconds. We set up a proportion. Let $x$ be the number of beats in 60 seconds. The ratio of beats to seconds is $\frac{15}{10}=\frac{x}{60}$. Cross - multiply: $10x = 15\times60$, then $x=\frac{15\times60}{10}=90$.

Answer:

90