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Orlov [11]
3 years ago
15

Solve the problem please

Mathematics
1 answer:
Molodets [167]3 years ago
4 0

Answer:

x = 9±sqrt(7)

Step-by-step explanation:

3(x-9)^2 =21

Divide each side by 3

3/3(x-9)^2 =21/3

(x-9)^2 =7

Take the square root of each side

sqrt((x-9)^2) =±sqrt(7)

x-9 =±sqrt(7)

Add 9 to each side

x = 9±sqrt(7)

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Answer:

0.36427

Step-by-step explanation:

Mean = λ = 18 messages per hour

P(X = x) = (e^-λ)(λ⁻ˣ)/x!

P(X ≤ x) = Σ (e^-λ)(λ⁻ˣ)/x! (Summation From 0 to x)

But the probability required is that the messages thay come in an hour is between 15 and 20, that is, P(15 < X < 20)

P(15 < X < 20) = P(X < 20) - P(X ≤ 15)

These probabilities will be evaluated using a cumulative frequency calculator.

P(X < 20) = 0.65092

P(X ≤ 15) = poissoncdf(18, 15) = 0.28665

P(15 < X < 20) = P(X < 20) - P(X ≤ 15) = 0.65092 - 0.28665 = 0.36427.

You can use the Poisson distribution calculator here

https://stattrek.com/online-calculator/poisson.aspx

4 0
3 years ago
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padilas [110]

Answer:

C) 16

Step-by-step explanation:

\dfrac{28+4}{2}=\dfrac{32}{2}=16

8 0
2 years ago
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prohojiy [21]

Answer:

look down

Step-by-step explanation:

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2 years ago
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What does 12(6-k) equal​
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\text{Hey there!}

\rightarrow\text{What does 12(6 - k) equal?}

\text{Well, the formula is: a(b + c) = a(b) + a(c) = ab + ac}

\bf{12( 6 - k) = 12(6) - 12(k)= \underline{72 -12k}}

\boxed{\boxed{\text{\bf{Thus, your answer is: 72 - 12k}}}}\checkmark

\text{Good luck on your assignment and enjoy your day!}

~\frak{LoveYourselfFirst:)}

8 0
3 years ago
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7.50 dollars because per each mile its $2.50 . and $2.50 times 3 equals $7.50
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