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Sergeu [11.5K]
2 years ago
10

The recommended heart rate for weight management exercise and improving cardio fitness, in beats per minute, depends on a person

's age and can be represented by the expression 0.7(220-a) what is the recommended heart rate for a 20 year old person?
Mathematics
2 answers:
Sidana [21]2 years ago
7 0

As per the question, the recommended heart rate (beats per minute) can be represented by the expression 0.7(220-a), i.e. 0.7 * (220-a), where a is the age of the person.

We have to determine the recommended heart rate for a 20-year old person.

Substituting the value 20 for a in the expression

⇒ Recommended heart rate = 0.7 * (220 - 20)

⇒ Recommended heart rate = 0.7 * (200)

⇒ Recommended heart rate = 140 beats per minute

hichkok12 [17]2 years ago
6 0

Answer:

Recommended heart rate of a person of age 20 years will be 140 beats per minute.

Step-by-step explanation:

Expression representing the heart rate in terms of beats per minute is = 0.7(220 - a) where a = age of the person.

Now we have to calculate the recommended heart rate for a person having age = 20 years.

Now we put a = 20 in the expression

Heart rate = 0.7(220 - 20)

                 = 0.7×(200)

                 = 140 beats per minute

Therefore, recommended heart rate of a person of age 20 years will be 140 beats per minute.

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murzikaleks [220]
So here we're dealing with equivalent fractions.
It's really simple to find the answer, so I'll try to explain the best I can.

2 dogs / 5 cats is really just 2/5.
If we want to find an equivalent fraction, we have to multiply the numerator and the denominator by the same number.

Currently the number of cats is 5, and we need it to be 140. What we need to do is find the number it has to be multiplied by to equal 140, which is 140 divided by 5. 140 divided by 5 is 28, so 5 x 28 = 140!

We need to multiply the denominator (5) by 28, so that we can get 140. What we have now is ?/140.

Like I said, to find an equivalent fraction, we need to multiply the numerator by the same number as we did the denominator, which is 28!

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The answer is D) 56 Dogs/140 Cats.

Hope this helps!
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Answer:

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