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pshichka [43]
3 years ago
11

Which of the following equations has infinitely many solutions?

Mathematics
1 answer:
Valentin [98]3 years ago
7 0

Answer:

B

Step-by-step explanation:

If you look at A and you subtract 3x by 4x you get x and you subtract 3 from -7 and you get -10. But if you look at B you do the stuff in the parentheses first and you get 4x+12x+28=16x+28 and they're the same so it's B.

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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
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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)

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