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iogann1982 [59]
3 years ago
9

WHICH ONE DOESN'T BELONG? Which figure does not belong with the other three? Explain your reasoning.

Mathematics
1 answer:
juin [17]3 years ago
5 0
The sphere. All the others are prisms.
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What is the value of x in 2/5(4x-3)-2x=4/5-x
gavmur [86]

Answer:

I think the answer is x = 10/3

Step-by-step explanation:

I hope this helps :)

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Which shows sets to which the number<br> on the number line belongs
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Integer,Irrational is the answer
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A student tries out for the track team and runs a lap in 45 seconds. The coach tells her she will have to cut her time by 50% to
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Hot dogs at a carnival cost $2.99 each plus 7% tax. What is the total cost for one hot dog?
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What does a irrational number look like
julia-pushkina [17]

A irrational number is a number that can't be expressed as a ratio of two whole numbers. That's it.

For examples (in increasing order of difficulty)

1 is a rational number because it is 1/1

0.75 is a rational number because it is equal to 3/4

2.333... (infinite number of digits, all equal to three) is rational because it is equal to 7/3.

sqrt(2) is not a rational number. This is not completely trivial to show but there are some relatively simple proofs of this fact. It's been known since the greek.

pi is irrational. This is much more complicated and is a result from 19th century.

As you see, there is absolutely no mention of the digits in the definition or in the proofs I presented.

Now the result that you probably hear about and wanted to remember (slightly incorrectly) is that a number is rational if and only if its decimal expansion is eventually periodic. What does it mean ?

Take, 5/700 and write it in decimal expansion. It is 0.0057142857142857.. As you can see the pattern "571428" is repeating in the the digits. That's what it means to have an eventually periodic decimal expansion. The length of the pattern can be anything, but as long as there is a repeating pattern, the number is rational and vice versa.

As a consequence, sqrt(2) does not have a periodic decimal expansion. So it has an infinite number of digits but moreover, the digits do not form any easy repeating pattern.

5 0
2 years ago
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