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4 years ago

Plzzz help I am stuck if u answer I will put u down as brainliest

Mathematics

1 answer:

Setler79 [48]4 years ago

6 0

Answer:

tge area of triangle is 36 in2 so she can only create 4 triangle

Step-by-step explanation:

area of square grid = 12 × 12

=144

area of triangle = 1/2 × 6 × 6

;;; = 18 ×2

=36

area if square grid/ area of triangle

=144/ 36

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Plz help me!!!

disa [49]

~kites have adjacent sides equal~

x = 3x-12

move 3x to the other side as a negative number

-2x = -12

divide both sides by -2

-12 divided by -2 is 6

so, x is equal to 6

but, we aren't done yet because the questions asks for the value of angle b

substitute the value we found into the equation for angle b

3(6)-12

36-12

24

so, angle b has a value of 24 degrees

7 0

3 years ago

Brian ate 2/3 of a pizza. His friend, Joseph, ate 1/4 of what was left. How much pizza did Joseph eat?

Natasha_Volkova [10]

Answer:

1/12

Steps:

1 - 2/3 = 1/3

1/3 / 4 = 1/3 × 1/4 = 1/12

3 0

3 years ago

Define the variables and write the equation.

gulaghasi [49]

I think is...

A=Andrews class
L=Laurens class

L-3=A

So, Laurens class has 3 less students than Andrews class.

3 0

3 years ago

A random sample of 110 lightning flashes in a certain region resulted in a sample average radar echo duration of 0.81 second and

Lina20 [59]

Answer:

a) $0.81-2.62\frac{0.34}{\sqrt{110}}=0.725$

$0.81+2.62\frac{0.34}{\sqrt{110}}=0.895$

So on this case the 99% confidence interval would be given by (0.725;0.895)

b) $n=(\frac{2.58(0.34)}{0.1})^2 =76.95 \approx 77$

So the answer for this case would be n=77 rounded up to the nearest integer

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".

$\bar X=0.81$ represent the sample mean

$\mu$ population mean (variable of interest)

s=0.34 represent the sample standard deviation

n=110 represent the sample size

Part a

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:

$df=n-1=110-1=109$

Since the Confidence is 0.99 or 99%, the value of $\alpha=0.01$ and $\alpha/2 =0.005$ , and we can use excel, a calculator or a table to find the critical value. The excel command would be: "=-T.INV(0.005,119)".And we see that $t_{\alpha/2}=2.62$

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

$0.81-2.62\frac{0.34}{\sqrt{110}}=0.725$

$0.81+2.62\frac{0.34}{\sqrt{110}}=0.895$

So on this case the 99% confidence interval would be given by (0.725;0.895)

Part b

The margin of error is given by this formula:

$ME=z_{\alpha/2}\frac{\sigmas}{\sqrt{n}}$ (a)

And on this case we have that ME =0.1 and we are interested in order to find the value of n, if we solve n from equation (a) we got:

$n=(\frac{z_{\alpha/2} \sigma}{ME})^2$ (b)

We can assume the following estimator for the population deviation $\hat \sigma =s =0.34$

The critical value for 99% of confidence interval now can be founded using the normal distribution. And in excel we can use this formla to find it:"=-NORM.INV(0.005;0;1)", and we got $z_{\alpha/2}=2.58/tex], replacing into formula (b) we got:
[tex]n=(\frac{2.58(0.34)}{0.1})^2 =76.95 \approx 77$

So the answer for this case would be n=77 rounded up to the nearest integer

4 0

3 years ago

Tim is an elementary school art teacher. His students are sculpting a replica of a shark out of clay. Tim has given them one blo

Darina [25.2K]

Radius = 1.25cm
81cm3 / 20 = 4.05 cm3 per cone
V cone = πr^2 (h/3)
So then 4.05 = π(1.25)^2 (h/3)
Then h/3 = .825 and then

h = 2.475 cm

8 0

3 years ago

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