Question

A veterinarian recorded a Guinea pig’s resting heart rate to be 225 beats over a 45-second time period. Complete the table to find the number of heartbeats in different amounts of time. Then find the constant of proportionality in beats per minutes

Chart

Number of minutes Number of heartbeats
0.25
0.5
0.75
1

Answer 1

Minutes Beats

0.25 81 2/3

0.5 163 1/3

0.75 245

1 326 2/3

Explanation:

We can find the rate:

225 beats(b) over 45-seconds(s) can be written as (245 b)/(45 s) or 5.444 b/s.

The table is in minutes (m), so lets convert the heart rate form b/s to b/m by converting:

(5.444 b/s)*(60 s/m) = 326 2/3 b/m

Now we can fill in the table.

(Time in Minutes)*(326 2/3 b/m) = Beats

Minutes Beats

0.25 81 2/3

0.5 163 1/3

0.75 245

1 326 2/3