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lisov135 [29]
3 years ago
12

Heart beats 2,320 times during 20 minutes of rowing. While resting the heart is beating 16 times in 15 seconds. What is the diff

erence between the heart rate when it is rowing versus resting?
Mathematics
2 answers:
Mrac [35]3 years ago
6 0

Answer: 0.87 times per second  (Or 52.2 times per minute)

Step-by-step explanation:

You need to make the conversion from minutes to seconds.

Remember that 1 minute has 60 seconds. Then 20 minutes to seconds is:

(20minutes)(\frac{60seconds}{1minute})=1,200seconds

Find the number of times the heart beats in 1 second when it is rowing:

x_1=\frac{(2,320times)}{1,200seconds}=1.93\ times\ per\ second

Find the number of times the heart beats in 1 second when it is resting:

x_2=\frac{(16times)}{15seconds}=1.06\ times\ per\ second

Then the difference is:

difference=(1.93-1.06)\ times\ per\ second\\difference=0.87\ times\ per\ second

(Or 52.2 times per minute)

Debora [2.8K]3 years ago
5 0

<u>Answer:</u>

0.87 beats per second

<u>Step-by-step explanation:</u>

We are given that the heart beats 2,320 times during 20 minutes of rowing.

So heart rate while rowing = \frac{2320}{20 \times 60} =\frac{2320}{1200} = 1.93 beats / second

And while resting, the heart beats 16 times in 15 seconds.

So heart rate while resting = \frac{16}{15} = 1.07 beats / second

Therefore, the difference between the two hearts rates = 1.93-1.07 = 0.87 beats per second

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Answer:

A = 437 mm²

Step-by-step explanation:

The general formula for the area of a triangle:

A = \frac{1}{2}bh, where 'b' is the measure of the base and 'h' is the measure of the height

Given the dimensions of the triangle in the picture:

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an architect wants to build three similar triangles such that the ratio of the middle triangle. The smallest one has side length
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<u>Step-by-step explanation:</u>

small:     5     12      13

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large:    45   108    117

Notice that to get from the small to the large, multiplied by 9

5(9) = 45    12(9) = 108    13(9) = 117

That is because the sides are proportional \dfrac{5}{45}=\dfrac{12}{108}=\dfrac{13}{117}\rightarrow\dfrac{1}{9}

To get from small to middle, multiply by 3  

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To solve it using proportions:

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Answer:

  (a) more

  (b) less

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Step-by-step explanation:

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(e) Susan needs 20, George needs 25, Antonio needs 30, Maria needs 45.

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