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4 years ago

GEOMETRY HELP URGENT?

Mathematics

1 answer:

nadezda [96]4 years ago

6 0

Let the centre be O and the line with one end point at the centre and another at the chord CD touches the chord at S .

So CS is the half of 36.7 = 18.35

$sin \angle COS = \frac{18.75}{21.8}$

$\angle COS = sin^{-1}(\frac{18.75}{21.8}) =59.35 degree\\$

Therefore,

$\angle COD =2*59.35 =118.7$

Therefore the measurement of arc CD is 118.7 degree.

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A marketing researcher wants to find a 96% confidence interval for the mean amount those visitors spend per person per day while

ki77a [65]

Answer:

$n=(\frac{2.054(12)}{4})^2 =37.97 \approx 38$

So then the minimum sample to ensure the condition given is n= 38

Step-by-step explanation:

Notation

$\bar X$ represent the sample mean for the sample

$\mu$ population mean (variable of interest)

$\sigma=12$ represent the population standard deviation

n represent the sample size

ME = 4 the margin of error desired

Solution to the problem

When we create a confidence interval for the mean the margin of error is given by this formula:

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

And on this case we have that ME =4 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)

The critical value for 96% of confidence interval now can be founded using the normal distribution. The significance is $\alpha=1-0.96 =0.04$ . And in excel we can use this formula to find it:"=-NORM.INV(0.02;0;1)", and we got $z_{\alpha/2}=2.054$ , replacing into formula (b) we got:

$n=(\frac{2.054(12)}{4})^2 =37.97 \approx 38$

So then the minimum sample to ensure the condition given is n= 38

5 0

4 years ago

6+y= -3<br> what’s the answer

erma4kov [3.2K]

Answer:

y=-9

Step-by-step explanation:

7 0

3 years ago

Read 2 more answers

A copy machine produces 80 copies in 5 minutes. How many would be produced in 40 minutes

Ksenya-84 [330]

80 copies --> 5 minutes
8 * 80 copies --> 8 * 5 minutes
640 copies --> 40 minutes

Answer: 640 copies

*Hope that helps and enjoy Brainly :)*

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3 years ago

Read 2 more answers

Who's good at Fractions? Will give Brainlest to who answers.

Inga [223]

You need to add two mixed numerals.
One is positive and one is negative.
To add a positive number and a negative number, first take the absolute value of both, making them both positive. Then subtract the smaller absolute value from the larger absolute value. Finally, the sign of the answer is the same sign as the number that has the larger absolute value.

The numbers are -4 5/8 and 2 1/8

Take absolute values:
|-4 5/8| = 4 5/8
|2 1/8| = 2 1/8

Subtract the smaller absolute value from the larger absolute value.

4 5/8 - 2 1/8 = 2 4/8 = 2 1/2

The greater absolute value is 4 5/8.
Since the number with the larger absolute value was -4 5/8, a negative number, the answer is negative, -2 1/2

-4 5/8 + 2 1/8 = - 2 1/2

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3 years ago

Find the equation of a line parallel to line y=6 that passes through the point (-2,-1)

ohaa [14]

Answer:

y=-1

Step-by-step explanation:

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3 years ago