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2 years ago

Photo for the question I asked a few seconds ago please help

Mathematics

2 answers:

Anastasy [175]2 years ago

8 0

Answer:

9160.88

Step-by-step explanation:

Hope this helps and have a wonderful day!!!

erik [133]2 years ago

7 0

Answer:

A≈9160.88

Step-by-step explanation:

A=πr^2=π·54^2≈9160.88418

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14. x2 – 100 = 0<br> Solve question by factoring

Lena [83]

Answer:

x=50

Step-by-step explanation:

1, add 100 to both sides

x-2-100+100=0+100

2. simplify x-2=100

3.x-2/2=100/2 divide both sides

4. x=50

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2 years ago

F(x)=-3x+1 , find:

kakasveta [241]

Just substitute the values in.
if f (x)=-3x+1

a.) f (1)=-3(1)+1
solve.
-3(1)=-3+1=-2

b.) f(-2)=-3(-2)+1
-3(-2)=6+1=7

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3 years ago

Read 2 more answers

Stella buys a one-pint bottle of juice for $2.72. What is the unit rate of the cost of the juice per fluid ounce? \text{1 gallon

alukav5142 [94]

9514 1404 393

Answer:

Stella bought 16 fl oz
$0.17 per fl oz is the unit rate

Step-by-step explanation:

1 pint is 2 cups, so is 2×8 fl oz = 16 fl oz

Then the unit rate of Stella's juice is ...

dollars/ounces = $2.72/(16 fl oz) = $0.17 /fl oz

The cost per fluid ounce is $0.17.

4 0

3 years ago

A random sample of 9 wheels of cheese yielded the following weights in pounds has a sample mean of 20.90 and a sample variance o

Ronch [10]

Answer:

$2.002 \leq \sigma^2 \leq 11.365$

Step-by-step explanation:

1) Data given and notation

s represent the sample standard deviation

$s^2$ represent the sample variance

n=9 the sample size

Confidence=90% or 0.90

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 mean or variance 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.

The Chi Square distribution is the distribution of the sum of squared standard normal deviates .

2) Calculating the confidence interval

The confidence interval for the population variance is given by the following formula:

$\frac{(n-1)s^2}{\chi^2_{\alpha/2}} \leq \sigma \frac{(n-1)s^2}{\chi^2_{1-\alpha/2}}$

On this case we need to find the sample standard deviation with the following formula:

$s=sqrt{\frac{\sum_{i=1}^9 (x_i -\bar x)^2}{n-1}}
The sample variance given was [tex]s^2=3.45$

The next step would be calculate the critical values. First we need to calculate the degrees of freedom given by:

$df=n-1=9-1=8$

Since the Confidence is 0.90 or 90%, the value of $\alpha=0.1$ and $\alpha/2 =0.05$ , and we can use excel, a calculator or a table to find the critical values.

The excel commands would be: "=CHISQ.INV(0.05,8)" "=CHISQ.INV(0.95,8)". so for this case the critical values are:

$\chi^2_{\alpha/2}=15.507$

$\chi^2_{1- \alpha/2}=2.732$

And replacing into the formula for the interval we got:

$\frac{(9)(3.45)}{15.507} \leq \sigma \frac{(9)(3.45)}{2.732}$

$2.002 \leq \sigma^2 \leq 11.365$

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3 years ago

On a coordinate plane, line A has a negative slope, line b is horizontal, line c is vertical, and line d has a positive slope.

Digiron [165]

Answer:

Step-by-step explanation:

It cannot be line a or line d because the line will have a constant rate of change. It cannot be line c because line c would be undifined. Therefore, it must be line b.

4 0

3 years ago