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3 years ago

NEED HELP ON THIS!!!!

Mathematics

2 answers:

tamaranim1 [39]3 years ago

7 0

Answer:

Its graph has a V-shape

There are two inputs for which the output is $5$

The vertex of its graph is at $(0, -2)$

Step-by-step explanation:

we have

$y=\left|x\right|-2$

Statements

case A) The value of the function is never negative.

The statement is false

The value of the function is negative in the interval------> $(-2,2)$

case B) Its graph has a V-shape

The statement is true

See the graph

case C) There is only one input for which the output is $0$

The statement is false

There are two inputs for which the output is equal to zero

For $x=-2$ and $x=2$

case D) There are two inputs for which the output is $5$

The statement is true

For $x=-7$ and $x=7$

case E) The vertex of its graph is at $(0, -2)$

The statement is true

see the graph

grandymaker [24]3 years ago

4 0

The value of the function is negative from -2 to 2, so A is false. The graph is shaped like a V, so B is true. y equals 0 twice, at -2 and 2, so C is false. y is 5 twice, at -7 and 7, so D is true. The vertex, or the sharp turn, is at (0,-2), so E is true. This means your answers are B, D, and E.

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The answer is 4 1/4.

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2 years ago

Simplify.

Vladimir [108]

Answer:

a. -3.78x-0.84

Step-by-step explanation:

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2 years ago

The proprietor of a boutique in New York wanted to determine the average age of his customers. A random sample of 25 customers r

jolli1 [7]

Answer:

$28-2.064\frac{10}{\sqrt{25}}=23.872$

$28+2.064\frac{10}{\sqrt{25}}=32.128$

So on this case the 95% confidence interval would be given by (23.9;32.1)

Step-by-step explanation:

Previous concepts

A confidence interval is "a range of values that’s likely to include a population value with a certain degree of confidence. It is often expressed a % whereby a population means lies between an upper and lower interval".

The margin of error is the range of values below and above the sample statistic in a confidence interval.

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".

$\bar X=28$ represent the sample mean

$\mu$ population mean (variable of interest)

s=10 represent the sample standard deviation

n=25 represent the sample size

Solution to the problem

The confidence interval for the mean is given by the following formula:

$\bar X \pm t_{\alpha/2}\frac{s}{\sqrt{n}}$ (1)

In order to calculate the critical value $t_{\alpha/2}$ we need to find first the degrees of freedom, given by:

$df=n-1=25-1=24$

Since the Confidence is 0.95 or 95%, the value of $\alpha=0.05$ and $\alpha/2 =0.025$ , and we can use excel, a calculator or a table to find the critical value. The excel command would be: "=-T.INV(0.025,24)".And we see that $t_{\alpha/2}=2.064$

Now we have everything in order to replace into formula (1):

$28-2.064\frac{10}{\sqrt{25}}=23.872$

$28+2.064\frac{10}{\sqrt{25}}=32.128$

So on this case the 95% confidence interval would be given by (23.9;32.1)

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3 years ago

1/2% of 412 with work

Trava [24]

Answer:

1.5% x 412 = 618?

Step-by-step explanation:

8 0

3 years ago

Read 2 more answers

Ok so this isn't actual homework but I need help calculating this.

jeka57 [31]

Ok so there is 60 minutes in an hour and you have 107 minutes so
107-60 = 47 ( 60 has become an hour)

So we are left with 47 minutes, so add the hour to 7:45 which will make it 8:45 pm
Then add 15 to make it 9:00 pm ( 47 - 15 = 32)

And so then add 32 minutes to 9:00 pm

Answer is 9:32 p.m.

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3 years ago