Numbers and the number system Flashcards by Ben Catchpole | Brainscape

Q

Prove that 0.222… = 2/9

A

x = 0.222…
10x = 2.222…
9x = 2

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Q

x^a*x^b

A

x^a+b

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Q

x^a/x^b

A

x^a-b

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Q

(x^a)^b

A

x^a*b

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Q

(a/b)ⁿ

A

aⁿ/bⁿ

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Q

aⁿ*bⁿ

A

(a*b)ⁿ

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Q

a^{n^m}

A

a^{(n^m)}

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Q

Set

A

Collection of elements

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Q

∪

A

Union - all the elements in A or B or both

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Q

∩

A

Intersection - the elements in A and B

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Q

∈

A

Is a member

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Q

∉

A

Is not a member

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Q

A^I

A

Everything not in A

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Q

Ø

A

Empty set

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Q

⊂

A

Is a subset

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Q

n(A)

A

Number of elements in A

Q

What is the formula for compound interest?

A

Original*Interest^{Number of time periods} = New