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2 years ago

What is the range of the quadratic function f(x)=2-x^2

Mathematics

1 answer:

dimulka [17.4K]2 years ago

7 0

(-infinity, 2]. Use the infinity symbol and not the word

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Match the vocabulary to the part of expression below

Fantom [35]

Answer:

Gas up in my room I don’t know how much you have to do that yet but

Step-by-step explanation:

Abc news I didn’t see you yesterday I didn’t answer you I didn’t answer your phone I didn’t answer your question I don’t understand why

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2 years ago

Use the Distributive Property to solve the equation.

Arada [10]

Answer:

x= - 9

Step-by-step explanation:

- 8(x +7) = 16
-8x - 56 = 16
-8x = 16 + 56
-8x = 72
x = 72 ÷ (-8)
x = -9

5 0

2 years ago

Two of the angles in a triangle measure 52 and 22 what must be the measure of the third angle

viktelen [127]

The measure of the third angle is 74

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2 years ago

A sample of size 6 will be drawn from a normal population with mean 61 and standard deviation 14. Use the TI-84 Plus calculator.

AVprozaik [17]

Answer:

$X \sim N(61,14)$

Where $\mu=61$ and $\sigma=14$

Since the distribution for X is normal then the distribution for the sample mean is also normal and given by:

$\bar X \sim N(\mu, \frac{\sigma}{\sqrt{n}})$

$\mu_{\bar X} = 61$

$\sigma_{\bar X}= \frac{14}{\sqrt{6}}= 5.715$

So then is appropiate use the normal distribution to find the probabilities for $\bar X$

Step-by-step explanation:

Previous concepts

Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".

The Z-score is "a numerical measurement used in statistics of a value's relationship to the mean (average) of a group of values, measured in terms of standard deviations from the mean". The letter $\phi(b)$ is used to denote the cumulative area for a b quantile on the normal standard distribution, or in other words: $\phi(b)=P(z$

Solution to the problem

Let X the random variable that represent the variable of interest of a population, and for this case we know the distribution for X is given by:

$X \sim N(61,14)$

Where $\mu=61$ and $\sigma=14$

Since the distribution for X is normal then the distribution for the sample mean $\bar X$ is also normal and given by:

$\bar X \sim N(\mu, \frac{\sigma}{\sqrt{n}})$

$\mu_{\bar X} = 61$

$\sigma_{\bar X}= \frac{14}{\sqrt{6}}= 5.715$

So then is appropiate use the normal distribution to find the probabilities for $\bar X$

8 0

2 years ago

Marshall can buy 5 T-shirts for $55.

Stells [14]

Answer:

$33

Step-by-step explanation:

55 divided by 5 is 11, so each shirt costs $11. So that means 3 shirts would be $33.

4 0

2 years ago

Read 2 more answers