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snow_lady [41]
3 years ago
6

Which expression is equivalent to 2/3 (6x − 9y)?

Mathematics
2 answers:
Monica [59]3 years ago
6 0

Answer:

4x-6y

Step-by-step explanation:

posledela3 years ago
6 0

Answer: =4x−6y

Step-by-step explanation: i dont know if that is what you need but i tried to help

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Can anyone help me answer this please and thank you?​
Naily [24]

Answer:

The answer should be 132 degrees.

Step-by-step explanation:

180-48= 132

3 0
3 years ago
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The volume of
algol [13]
1/10 of an ounce is the answer

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3 years ago
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The heights of a random sample of 50 college students showed a mean of 174.5 centimeters and a standard deviation of 6.9 centime
Minchanka [31]

Answer:

Step-by-step explanation:

Hello!

For me, the first step to any statistics exercise is to determine what is the variable of interest and it's distribution.

In this example the variable is:

X: height of a college student. (cm)

There is no information about the variable distribution. To estimate the population mean you need a variable with at least a normal distribution since the mean is a parameter of it.

The option you have is to apply the Central Limit Theorem.

The central limit theorem states that if you have a population with probability function f(X;μ,δ²) from which a random sample of size n is selected. Then the distribution of the sample mean tends to the normal distribution with mean μ and variance δ²/n when the sample size tends to infinity.

As a rule, a sample of size greater than or equal to 30 is considered sufficient to apply the theorem and use the approximation.

The sample size in this exercise is n=50 so we can apply the theorem and approximate the distribution of the sample mean to normal:

X[bar]~~N(μ;σ2/n)

Thanks to this approximation you can use an approximation of the standard normal to calculate the confidence interval:

98% CI

1 - α: 0.98

⇒α: 0.02

α/2: 0.01

Z_{1-\alpha /2}= Z_{1-0.01}= Z_{0.99} =2.334

X[bar] ± Z_{1-\alpha /2} * \frac{S}{\sqrt{n} }

174.5 ± 2.334* \frac{6.9}{\sqrt{50} }

[172.22; 176.78]

With a confidence level of 98%, you'd expect that the true average height of college students will be contained in the interval [172.22; 176.78].

I hope it helps!

4 0
3 years ago
Help (the answer isn't the 2nd one my friend did this test and chose that and got it wrong please )
Artyom0805 [142]

Answer: 4 and 3/5

Step-by-step explanation:

7 0
3 years ago
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Find the derivative of f(x) = 7 divided by x at x = 1.
julsineya [31]
I find it best to switch everything exponents when taking derivatives.
F(x) = 7/x
Same as..
F(x) = 7x^-1
Take derivative..
F'(x) = -7x^-2
Plug in x = 1
F'(1) = -7(1)^-2
F'(1) = -7
3 0
3 years ago
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