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3 years ago

5) Telephone numbers in the

Mathematics

1 answer:

rodikova [14]3 years ago

3 0

Answer:

6,400,000,000 (6.4 billions)

Step-by-step explanation:

We have a total of 10 digits, and each digit was 10 possibilities of being filled, except the first digit of the area code and first digit of the telephone number, that have only 8 possibilities.

So if 8 digits have 10 possible values and 2 digit has 8 possible values, the number of possible telephone numbers is:

10^8 * 8^2 = 6,400,000,000 (6.4 billions)

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How do I turn 1/4 into a decimal?

dybincka [34]

Answer:

No problem ;)

Step-by-step explanation:

1/4: 0.25

2/4:0.50

3/4: 0.75

4/4(1): 1

Hope this helps you!

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GREYUIT [131]

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99.7%

Step-by-step explanation:

Note that 92 and 128 are 3 standard deviations from the mean

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3 years ago

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Answer:

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3 years ago

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Find the coordinates of the other endpoint of the segment, given its midpoint and one endpoint. (Hint: Let (x,y) be the unkno

spin [16.1K]

The other endpoint is (1, -17).

The midpoint formula is:

$m=(\frac{x_1+x_2}{2}, \frac{y_1+y_2}{2})$

Using our midpoint and endpoint, we have:
$(6, -11) = (\frac{11+x_2}{2}, \frac{-5+y_2}{2})
\\
\\6=\frac{11+x_2}{2} \text{ and } -11=\frac{-5+y_2}{2}
$

For the first equation (to find the x-coordinate) we will multiply both sides by 2:
$6\times2=\frac{11+x_2}{2}\times 2
\\
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Subtract 11 from both sides:
12 - 11 = 11+x₂ - 11
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For the second equation (the y-coordinate) we multiply both sides by 2:
$-11\times2=\frac{-5+y_2}{2}\times 2
\\
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Add 5 to both sides:
-22+5 = -5+y₂ + 5
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3 years ago

If 3x - 6 = 21, what is the value of x - 2 ?

lora16 [44]

3x-6=21
Or,3x=27
Or,x=27/3
Or,x=9
So,Now,
X-2=9-2
=7
Hope it helps

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3 years ago