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3 years ago

Add the two expressions -4.2x+3 and 2.5x-6 please help me with this

Mathematics

2 answers:

dalvyx [7]3 years ago

6 0

-1.7×-6 is the answer. Hope this helps.

zysi [14]3 years ago

4 0

Answer:

-1.7x + -3

Step-by-step explanation:

−4.2x+3 +2.5x−6

−4.2x+3

2.5x−6

Hope This Helped <3

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A home has a triangular backyard. The second angle of the triangle is 6º more than the first angle. The third angle is 14º more

Leto [7]

Answer:

The three angles of the triangle are 40, 45, and 95. Done.

4 0

3 years ago

Dennis has 14 skittles. If Dennis gave equal numbers of skittles to his 8 friends and then ate what was left, how many skittles

lara [203]

Answer:

1.75

Step-by-step explanation:

Just divide 14 by 8 and you get your answer !!!!

4 0

3 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

3 years ago

How much longer is the ring - necked snake than the red -bellied snake?

olga_2 [115]

Answer:

4.6 inches

hope it helps

Step-by-step explanation:

11.5 x 1.4 = 16.1

16.1 - 11.5 = 4.6

4 0

4 years ago

What is the balance as a result of having a credit of $84 and a debit of $29?

34kurt

Hello!
I would be more than happy to help!
So to find the balance use this equation.

Balance = Credit- Debit

In other words, to find BALANCE... You Subtract Debit from Credit

whats my credit? 84$
Whats my debit? 29$
Whats my balance? Lets find out! How? Well, lets subtract my credit (84) from my debit (29).

84-29= 55

Balance =55

Hope this helped!

8 0

3 years ago