Question

1. the heart rates of different animals are shown below.

dog	lion	elephant	chicken
200 beats in 2 minutes	40 beats in 1 minute	140 beats in 4 minutes	120 beats in 30 seconds

a. write each rate as a unit rate (number of beats in 1 minute)

Explanation:

Step1: Calculate dog's unit - rate

To find the number of beats per minute for the dog, divide the total beats by the total minutes. The dog has 200 beats in 2 minutes. So, the unit rate is $\frac{200}{2}=100$ beats per minute.

Step2: Calculate lion's unit - rate

The lion has 40 beats in 1 minute, so the unit rate is 40 beats per minute.

Step3: Calculate elephant's unit - rate

The elephant has 140 beats in 4 minutes. Divide the total beats by the total minutes: $\frac{140}{4} = 35$ beats per minute.

Step4: Calculate chicken's unit - rate

The chicken has 120 beats in 30 seconds. Since 30 seconds is 0.5 minutes, divide the total beats by the total minutes: $\frac{120}{0.5}=240$ beats per minute.

Answer:

Dog: 100 beats per minute
Lion: 40 beats per minute
Elephant: 35 beats per minute
Chicken: 240 beats per minute