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3 years ago

The area of a circle is 36 n cm2?.

Mathematics

1 answer:

jok3333 [9.3K]3 years ago

6 0

Answer:

R = 6

Step-by-step explanation:

Remember... Circle area is:

A = pi×R^2

Where R is the circle radius.

Then,

Pi×R^2=36×Pi

R = square root of 36

R = 6

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A random sample of n measurements was selected from a population with unknown mean μ and known standard deviation σ. Calculate a

vivado [14]

Answer:

The 95% confidence interval for μ for the given situation is between 87.49 and 94.51.

Step-by-step explanation:

We have that to find our $\alpha$ level, that is the subtraction of 1 by the confidence interval divided by 2. So:

$\alpha = \frac{1-0.95}{2} = 0.025$

Now, we have to find z in the Ztable as such z has a pvalue of $1-\alpha$ .

So it is z with a pvalue of $1-0.025 = 0.975$ , so $z = 1.96$

Now, find the margin of error M as such

$M = z*\frac{\sigma}{\sqrt{n}}$

In which $\sigma$ is the standard deviation of the population and n is the size of the sample.

$M = 1.96\frac{20}{\sqrt{125}} = 3.51$

The lower end of the interval is the sample mean subtracted by M. So it is 91 - 3.51 = 87.49

The upper end of the interval is the sample mean added to M. So it is 91 + 3.51 = 94.51

The 95% confidence interval for μ for the given situation is between 87.49 and 94.51.

5 0

3 years ago

Read 2 more answers

(X+9)(x-2)-9x-6 is equivalent to?

Allushta [10]

Answer:

$x^{2}$ - 2x - 24

Step-by-step explanation:

(x + 9)(x - 2) - 9x - 6

$x^{2}$ - 2x + 9x - 18 - 9x - 6 Multiply.

$x^{2}$ - 2x - 24 Combine the like terms.

4 0

2 years ago

Gabe has an outstanding balance on four different credit cards. Which method of paying off his credit card debt will save him mo

Ivanshal [37]

Is this multiple choice?

8 0

4 years ago

Solve 3[-x + (2 x + 1)] = x - 1.<br> x = 2

Gekata [30.6K]

Answer:

x = -2

Step-by-step explanation:

$3[- x + (2x + 1)] = x - 1$

$= > 3[ - x + 2x + 1 ] = x - 1$

$= > 3[x + 1] = x - 1$

$= > 3x + 3 = x - 1$

$= > 3x - x = - 1 - 3$

$= > 2x = - 4$

$= > x = \frac{ - 4}{2} = - 2$

7 0

3 years ago

PLEASE ANSWER THIS QUESTION RIGHT Name the x-intercept(s)?<br> A:0 and 4,B:2,C:4,D:0.

harina [27]

Answer:

A. 0 and 4

Step-by-step explanation:

The x-intercepts are simply the values of x when y = 0. In other words it is the points where the line curve intercepts or cuts across the x-axis.

Form the graph given, we can see that at x = 0 and x = 4, the value of y = 0. Simply put, the curve cuts the x-axis at x = 0 and x = 4.

x-intercepts are 0 and 4.

7 0

3 years ago