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Nady [450]
3 years ago
13

A skateboarder went a kilometer in 3 minutes with the wind, and returned in four minutes against the wind.

Mathematics
1 answer:
inn [45]3 years ago
8 0

Step-by-step answer:

Answer to problems of this kind is the reciprocal of the harmonic mean of the time required.

We need to find the average of the speeds, not the average of the time.

The respective speeds are 1/3 and 1/4.

The average of the speeds is therefore (1/3+1/4)/2 = 7/24  (harmonic mean of the time taken).

The time required is therefore the reciprocal of the unit speed,

T = 1/(7/24) = 24/7 = 3 3/7 minutes, or approximately 3.43 minutes.

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A set of data with 750 numbers is normally
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Answer:

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6 0
3 years ago
Is 9.521521521 rational or irrational
enyata [817]

If the numbers after the decimal terminate, yes, it's rational.

9.521521521 = 9,521,521,521 / 1,000,000,000

If they don't terminate, but the pattern continues (which I suspect is the case here), yes, it's still rational.

If <em>x</em> = 9.521521521…, then

1000<em>x</em> = 9521.521521521…

Subtract <em>x</em> from this to eliminate the fractional part:

1000<em>x</em> - <em>x</em> = 9521.521521521… - 9.521521521…

999<em>x</em> = 9512

<em>x</em> = 9512/999

If they don't terminate, but the pattern does <em>not</em> continue, meaning the next few digits could be something random like

9.521521521<u>19484929271283583457</u>…

then the number would be irrational.

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2 years ago
-13.4&gt;=6.7+4.3+w solve the inequality
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I'm pretty sure the answer is -23.4>=w
8 0
3 years ago
Read 2 more answers
SOMEONE HELP PLEASE <br> WILL GIVE PERSON WHO IS RIGHT BRAINLIST
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Step-by-step explanation:

ur ans n fine me brainlist!

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