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Pavlova-9 [17]
2 years ago
10

10. Factor Please help me I will mark as brainliest

Mathematics
1 answer:
suter [353]2 years ago
6 0

Answer:

<u>(3w + 7)² or (3w + 7)(3w + 7)</u>

Step-by-step explanation:

<u>Identity</u>

  • a² + 2ab + b² = (a + b)² = (a + b)(a + b)

<u>Solving</u>

  • 9w² + 42w + 49
  • (3w)² + 2(3w)(7)  + (7)²
  • <u>(3w + 7)² or (3w + 7)(3w + 7)</u>
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I need this answered it’s a math writing assignment
madreJ [45]

Answer:

It tells you that whatever f equals if you multiply it by three it will equal 16.

Step-by-step explanation:

16 divided by 3 = 5.333333...

f = 5.33333...

Pls Mark Brainliest

7 0
3 years ago
Original price of a dress:26.40,discount:10%
stealth61 [152]

Answer:

2.64

Step-by-step explanation:

10/100 = 0.1

0.1 x 26.40 = 2.64

So the final answer is 2.64

4 0
3 years ago
1. A food safety guideline is that the mercury in fish should be below 1 part per million​ (ppm). Listed below are the amounts o
Sauron [17]

Answer:

The confidence interval estimate of the population mean is :

(0.61 ppm, 0.90 ppm)

The correct option is (A).

Step-by-step explanation:

The amounts of mercury​ (ppm) found in tuna sushi sampled at different stores in a major city are:

S = {0.58, 0.82, 0.10, 0.98, 1.27, 0.56, 0.96}

A (100-\alpha )\% confidence interval for the population mean (μ) is an interval estimate of the true value of the mean. This interval has a (100-\alpha )\% probability of consisting the true value of mean.

⇒ Since the population standard deviation is not provided we will use the <em>t</em>-distribution to construct the 99% confidence interval for mean.

⇒ The formula for confidence interval for the population mean is:

                                          \bar x\pm t_{\alpha/2,(n-1)}\times \frac{s}{\sqrt{n}}

Here,

\bar x = sample mean

<em>s </em>= sample standard deviation

<em>n</em> = sample size

t_{\alpha/2,(n-1)} = critical value.

The degrees of freedom for the critical value is, (<em>n</em> - 1) = 7 - 1 = 6.

The significance level is: \alpha =1-Confidence\ level=1-0.99=0.01

The critical value is:

t_{\alpha/2,(n-1)}=t_{0.01/2, 7}=t_{0.05,7}=3.143

**Use the <em>t</em>-table for the critical value.

Compute the sample mean and sample standard deviation as follows:

\bar x=\frac{1}{7}(0.58+ 0.82+ 0.10+ 0.98+ 1.27+ 0.56+ 0.96) =0.753

\int\limits^a_b {x} \, dx s=\sqrt{\frac{\sum (x{i}-\bar x)^{2}}{n-1} } =\sqrt{\frac{1}{6} \times 0.859743} =0.379

The 99% confidence interval for μ is:

x^{2} CI=0.753\pm 3.143\times\frac{0.379}{\sqrt{7}} \\=0.753\pm0.143\\=(0.61, 0.896)\\\approx(0.61, 0.90)

The confidence interval estimate of the population mean is:

(0.61 ppm, 0.90 ppm)

The upper and lower limit of the 99% confidence interval indicates that the true mean value is less than 1 ppm. This implies that there is not too much mercury in tuna sushi

Because it is possible that the mean is not greater than 1 ppm. Also, at least one of the sample values is less than 1 ppm, so at least some of the fish are safe.

Thus, the correct option is (A).

6 0
3 years ago
What is the value of 3(4x+5y) - 2(7x-3y) when x = -2 and y = 3
Shkiper50 [21]

Answer:

67

Step-by-step explanation:

Subsitute both given values into the equation then continue to simplify the equation

3(4(-2)+5(3)) -2(7(-2)-3(3))

3(-8+15) -2(-14-9)

3(7) -2(-23)

21 +46

67

6 0
3 years ago
Read 2 more answers
What is the mean absolute deviation of astroids data to answer the question first find the mean next fill in the table for the a
skelet666 [1.2K]

Answer:

8.6666666666667 is the answer

Step-by-step explanation:

3 0
2 years ago
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