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3 years ago

Please help!!! ill give brainliest

Mathematics

2 answers:

yawa3891 [41]3 years ago

7 0

Answer:

Step-by-step explanation:

divide the number then add on

Mekhanik [1.2K]3 years ago

3 0

You can solve this using the Quadratic Formula, x =.

a = 1, b = -12, c = 59

x = Multiply 4 and 1

x = Multiply 2 and 1

x = Multiply -4 and 59

x = Square 12

x = Subtract

x = You can't find the square root of negatives, so factor the -92 out.

x = You can find the square of 4, so take that out.

x = Split the expression into two parts

x = (+ or -) The 2 in the numerator and the 2 in the denominator cancel each other out

x = (+ or -) Divide 12 by 2

x = 6 (+ or -) Now, split the solution into the plus and minus parts.

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2. Follow the process used to simplify the expression. Tell if it was done correctly. If not, explain and correct the error by s

wariber [46]

Answer:

No, the simplification is not done correctly. When multiplying

$\frac{2}{3}\times-9$ we should get -6 instead of -9.

the correct answer is 12k-8

Step-by-step explanation:

We need to tell if process was done correctly. If not, explain and correct the error by showing your own work.

The steps given are:

$\frac{2}{3} (6k - 9) + 8k - 2\\=4k - 9 + 8k - 2\\=12k - 11$

No, the simplification is not done correctly. When multiplying

$\frac{2}{3}\times-9$ we should get -6 instead of -9.

Correcting the error:

$\frac{2}{3} (6k - 9) + 8k - 2\\=4k - 6 + 8k - 2\\=12k - 8$

So, the correct answer is 12k-8

5 0

3 years ago

According to a bridal magazine, the average cost of a wedding reception for an American wedding is $8213. Assume that this avera

Thepotemich [5.8K]

Answer:

a. The point estimate of the corresponding population mean is of $8213.

b. The margin of error is of $103.

c. The 98% confidence interval for the corresponding population mean is between $7973.5 and $8452.5, which means that for all weedings, we are 98% sure that the true population mean is in this interval.

Step-by-step explanation:

Central Limit Theorem

The Central Limit Theorem estabilishes that, for a normally distributed random variable X, with mean $\mu$ and standard deviation $\sigma$ , the sampling distribution of the sample means with size n can be approximated to a normal distribution with mean $\mu$ and standard deviation $s = \frac{\sigma}{\sqrt{n}}$ .

For a skewed variable, the Central Limit Theorem can also be applied, as long as n is at least 30.

a. What is the point estimate of the corresponding population mean?

The sample mean is of $8213. So, by the Central Limit Theorem, the point estimate of the corresponding population mean is of $8213.

b. What is the margin of error for this estimate (use2 standard deviations (divided by Vn) to either side of the mean is used when no specific confidence level is stated).

Sample of 450, standard deviation of $2185. So

$M = \frac{2185}{\sqrt{450}} = 103$

The margin of error is of $103.

c. Create and interpret a 98% confidence interval for the corresponding population mean.

The confidence interval is given by:

$\mu \pm M*z$

In which $\mu$ is the sample mean and z is the value related to the confidence level.

98% confidence level

So $\alpha = 0.02$ , z is the value of Z that has a pvalue of $1 - \frac{0.02}{2} = 0.99$ , so $Z = 2.325$ .

Then

$\mu - M*z = 8213 - 2.325*103 = 7973.5$

$\mu + M*z = 8213 + 2.325*103 = 8452.5$

The 98% confidence interval for the corresponding population mean is between $7973.5 and $8452.5, which means that for all weedings, we are 98% sure that the true population mean is in this interval.

4 0

3 years ago

What is the equation of a line that passes through the point (8, 1) and is perpendicular to the line whose equation is y=−23x+5y

wolverine [178]

Answer:

The correct answer is: y=3/2x-11 :D

4 0

3 years ago

Read 2 more answers

Chef Daniel had 431 ounces of chocolate frosting in his refrigerator. It takes 8 ounces of frosting to frost one cupcake. How ma

Alex

Answer:

53 cupcakes

Step-by-step explanation:

Take the amount of frosting and divide by the amount needed per cupcake

431/8

53.875

We round down since we cannot frost part of a cupcake

53 cupcakes

7 0

4 years ago

Read 2 more answers

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4 0

4 years ago