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3 years ago

3n+8=20 i need help i think it is algerbra

Mathematics

2 answers:

Minchanka [31]3 years ago

7 0

3n+8=20
8+3n=20
3n=20+-8
3n=12
n=4

tia_tia [17]3 years ago

4 0

turn the problem around

20-8=12

12/3=4

Your answer is 4.

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2 years ago

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Step-by-step explanation:

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3 years ago

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3 years ago

Use the frequency table to find the mean number of working TV sets in students' homes. (picture attached)

LenaWriter [7]

The correct option is : 2

Explanation

For finding the mean number of working TV sets, we need to divide the total number of TV sets by the total frequency.

Now for finding the total number of TV sets, first we will multiply each number of TV sets by it's frequency and then sum up all the results.

So, the total number of TV sets

$=(0*1)+(1*8)+(2*9)+(3*4)+(4*3) \\\\ =0+8+18+12+12=50$

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5 0

3 years ago

How do i turn reapeating decimals into fractions?

inysia [295]

Easy example that shows $0.999\ldots=1$ :

Let $x=0.999\ldots=0.\overline9$ .

Then $10x=9.999\ldots=9.\overline9$ .

So $10x-x=9.\overline9-0.\overline9$ , or $9x=9$ , and so $x=1$ .

The basic idea is to find the period of the repeating decimal, move the $n$ digits belonging to one period over to the left of the decimal point by multiplying by $10^n$ , then subtract the original repeating decimal from this new number, and finally divide by $10^n-1$ .

A slightly more complicated example:

Let $x=0.142857142857142857\ldots=0.\overline{142857}$ .

Then $10^6x=142857.\overline{142857}$ .

Then $10^6x-x=142857.\overline{142857}-0.\overline{142857}$ , or

$999999x=142857\implies x=\dfrac{142857}{999999}=\dfrac17$

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3 years ago