please help me brainly I need help!

The x-intercepts of the given quadratic function are: d: 3, -3/2

The general form of expression of a quadratic function is:

y = ax² + bx + c

The formula to find the roots of quadratic functions is:

x = [-b ± √(b² - 4ac)]/2a

We are given the quadratic equation as:

y = 2x² - 3x - 9

Thus:

x =  [-(-3) ± √((-3)² - 4(2 * -9))]/2(2)

x = (3 ± 9)/4

x = 3, -3/2

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a) The 95% confidence interval for the true proportion of seeds that germinate based on the sample is (0.856, 0.944).

b) The sample does not provide evidence that the claim of 93% germination is wrong, but it does suggest that the true proportion of seeds that germinate may be lower than the claimed proportion.

To find a confidence interval for the true proportion of seeds that germinate, we can use the following formula

CI = p ± z√(p(1-p)/n)

where p is the sample proportion, z is the z-score corresponding to the desired confidence level (95% in this case), and n is the sample size.

a. Using the given values, we have:

p = 180/200 = 0.9

z = 1.96 (from a standard normal distribution table for a 95% confidence level)

n = 200

Plugging these values into the formula, we get

CI = 0.9 ± 1.96√(0.9(1-0.9)/200) = (0.856, 0.944)

Therefore, we can be 95% confident that the true proportion of seeds that germinate is between 0.856 and 0.944.

b. To determine if this provides evidence that the claim is wrong, we can check if the confidence interval includes the claimed proportion of 0.93. Since 0.93 is within the confidence interval of (0.856, 0.944), we cannot conclude that the claim is wrong based on this sample. However, we can say that the sample provides evidence that the true proportion of seeds that germinate may be lower than the claimed proportion.

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The possible combination is 6552.

For each of the 4 numbers in the combination, there are 9 digits to pick from, making the following total number of possibilities entirely possible:

9 x 9 x 9 x 9 = 6561

The number of possibilities with identical values for all four digits must be subtracted, nevertheless.

There is only one combination for each of the nine possible ways to select the digit that will occur four times (1, 2, 3, 4, 5, 6, 7, 8, or 9).

Therefore, the total number of possible combinations with the given restriction is:

6561 - 9 = 6552.

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Answer:213/412

Step-by-step explanation:

To get a ratio to fraction, make first number numerator and second number as denominator.

213/412 has no LCM, which means it cannot be simplified

The equation is balanced since an alpha particle was emitted.

As, Natural transformation happens on its own because of the element's half life. Unlike natural transmutation, which requires exposing one element to another element or particle by induction or bombardment.

The radon element transforms into polonium and an alpha particle in the example inquiry. The equation is as follows:

[tex]_{86}^{219}RN[/tex] => [tex]_{84}^{215}Po[/tex] + [tex]_{2}^{4}a[/tex]

Therefore, the equation is balanced since an alpha particle was emitted.

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Step-by-step explanation:

Area of the large trapezoid :

   height * average of bases

     area = 8 * (6+11)/2 = 68 cm^2

  MINUS the area of the parallelogram   4x3 =12 cm^2

68 - 12 = 56 cm^2 = shaded region

The names of the angles, vertices and sides are listed below

The vertex is the point where two sides meet; and at this vertex, an angle is formed

Using the above definition as a guide, we have

The names of the angles in four ways are

Using the definition of vertex above, the names of the angles are

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At the 0.05 level of significance, we can conclude that there is a significant difference between the population mean credit card charges for groceries and the population mean credit card charges for dining out. The exact p-value is not provided, but since the t-statistic falls in the rejection region, we can infer that the p-value is less than 0.05.

a. The null hypothesis (H0) is that there is no significant difference between the population mean credit card charges for groceries and the population mean credit card charges for dining out. The alternative hypothesis (Ha) is that there is a significant difference between the two population means.

b. To test the null and alternative hypotheses, we need to use a two-tailed t-test since we do not have any prior knowledge about the direction of the difference. We will use a level of significance of .05.

Using the formula for the t-test, we get:

t = (x1 - x2) / [s / sqrt(n)]

where:

x1 = sample mean for groceries
x2 = sample mean for dining out
s = sample standard deviation
n = sample size

Plugging in the values, we get:

t = (0 - 850) / [1,123 / sqrt(42)] = -4.72

The degrees of freedom (df) for this test is (n1 + n2 - 2) = 40.

Using a t-distribution table with df = 40 and a level of significance of .05, we find the critical values to be ±2.021. Since our calculated t-value (-4.72) is outside the critical values, we reject the null hypothesis.

The p-value for this test is the probability of getting a t-value as extreme or more extreme than our calculated t-value (-4.72) under the null hypothesis. Using a t-distribution table with df = 40, we find the p-value to be less than .0001. Therefore, we can conclude that there is a significant difference between the population mean credit card charges for groceries and the population mean credit card charges for dining out.
a. The null and alternative hypotheses can be formulated as follows:

Null hypothesis (H 0): μ1 - μ2 = 0 (There is no difference between the population mean credit card charges for groceries and the population mean credit card charges for dining out)

Alternative hypothesis (H 1): μ1 - μ2 ≠ 0 (There is a difference between the population mean credit card charges for groceries and the population mean credit card charges for dining out)

b. Given the information provided, we have:

Sample mean difference (d) = $850
Sample standard deviation (sd) = $1,123
Sample size (n) = 42
Level of significance (α) = 0.05

To test the hypothesis, we need to calculate the t-statistic:

t = (d - 0) / (sd / √n) = (850 - 0) / (1123 / √42) ≈ 5.46

Using a two-tailed t-test with a level of significance of 0.05 and 41 degrees of freedom (n-1), the critical values are approximately -2.02 and +2.02.

Since the calculated t-statistic (5.46) is greater than the critical value (+2.02), we reject the null hypothesis.

Conclusion: At the 0.05 level of significance, we can conclude that there is a significant difference between the population mean credit card charges for groceries and the population mean credit card charges for dining out. The exact p-value is not provided, but since the t-statistic falls in the rejection region, we can infer that the p-value is less than 0.05.

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A data analyst who wants to create a visualization that demonstrates how often data values fall into certain ranges should use option A: histogram.

The distribution of a continuous variable is depicted by a histogram, a form of bar graph, by splitting the data into intervals, or bins, and charting the number of observations that fall within each bin. The range of values being measured are shown on the x-axis as intervals or bins, and the frequency or count of observations inside each bin is shown on the y-axis.

When presenting a distribution's shape, such as whether it is symmetrical or skewed, and when locating outliers or data gaps, histograms are especially helpful. They are frequently used to analyze and show data in disciplines including statistics, data science, and quality control.

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Correct question:

a data analyst wants to create a visualization that demonstrates how often data values fall into certain ranges. what type of data visualization should they use?

histogram

line graph

correlation charts

catter plot

Answer:

C

Step-by-step explanation:

How we got this answer was by looking at the problem and looking for similar LOOKING answers and after that we are left with c and d then we have to look and see how far the sign goes and we see C is the same or equivalent to the problem

PLS GIVE BRAINLIST MEAN THE WORLD all you have do is when two people answer if app it should be by rating if web should be on top of the question

HAVE A NICE DAY!

If  arithmetic mean of the monthly salaries of two people is $4360. One person earns $3479 per month then the monthly salary of the other person is $5241

The arithmetic mean of the monthly salaries of two people is $4360

One person earns $3479 per month

We have to find the monthly salary of the other person

Arithmetic mean = a+b/2

4360 = 3479+b/2

4360×2 = 3479+b

8720 = 3479+b

Subtract 3479 from both sides

8720-3479 =b

$5241 =b

Hence, $5241 is the  monthly salary of the other person.

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The width of the archway at ground level, given the height can be found to be 42.42 meters.

To find the width of the parabolic archway at ground level, the formula is:

y = a ( x - h ) ² + k

The height given is 23 meters and the width is 12 meters so the value of a can be found to be :

23 = a ( 6 - 0 ) ² + 25

23 = a ( 6 ) ² + 25

-2 = 36 a

a = -1 /18

We can then find the width of the archway at ground level:

0 = ( -1 /18 )( x ²) + 25

x ² = 450

x = ± √ 450

The width of the archway at ground level is:

= 2 x √ 450

= 2 x 21. 21

= 42.42 meters

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-2x+24 is equivalent to expression -3(2x-8)+4x.

Option B is the correct answer.

We have,

First, simplify the expression inside the parentheses:

-3(2x-8) = -6x + 24

Then substitute this into the original expression:

-3(2x-8)+4x = -6x + 24 + 4x = -2x + 24

Therefore,

The equivalent expression is -2x+24.

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The scale factor used in the dilation is 1/2

From the question, we have the following parameters that can be used in our computation:

The scale factor is calculated as

Scale factor  = A'/A

Substitute the known values in the above equation, so, we have the following representation

Scale factor  = (-1, 3)'/(-2, 6)

Evaluate

Scale factor  = 1/2

Hence, the scale factor is 1/2

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Answer:

Two milk containers = 398 +436= 834L

Left in both containers= 18L

Step-by-step explanation:

so maximum capacity of drum= 834-18=816L

Answer:

44°

Step-by-step explanation:

We Know

The sum of three angles in a triangle must add up to 180°.

Let's solve

3x + 15 + 4x - 12 + 79 = 180°

7x + 82 = 180°

7x = 98°

x = 14

Now we put 14 in for the x and find the other 2 missing angles.

3x + 15

3(14) + 15

42 + 15

57°

4x - 12

4(14) - 12

56 - 12

44°

So, the measure of the three angles are: 44°, 57°, and 79°. So, the measure of the smallest angle is 44°

Answer:

Step-by-step explanation:

The area of a circle is given by the formula:

area = π x (radius)²

where the radius is half of the diameter. In this case, the radius of the cookie cake is:

radius = 14 / 2 = 7 inches

Using π = 3.14, the area of the entire cookie cake is:

area = 3.14 x 7² = 3.14 x 49 ≈ 153.86 square inches

To find half of the cookie cake, we need to divide this area by 2:

half area = 153.86 / 2 = 76.93 square inches

Rounding the answer to the nearest whole number, we get:

half area ≈ 77 square inches

Therefore, the answer is approximately 77 square inches. The closest option is D) 76.93 square inches.

Answer:

A- x - y = z

Step-by-step explanation:

A = x + y + z

- x

A - x = y + z

- y

A- x - y = z

The base five representation of 2414₆ is 43234₅.

Base five representation is a way of representing numbers using only the digits 0, 1, 2, 3, and 4. This system is also known as quinary or pentimal.

To convert the number 2414₆ to base five, we need to first convert it to base 10 and then convert the result to base five.

To convert 2414₆ to base 10, we can use the formula

2 × 6³ + 4 × 6² + 1 × 6¹ + 4 × 6⁰ = 432 + 144 + 6 + 4 = 586₁₀

Now we can convert 586₁₀ to base five using the following steps

586 ÷ 5 = 117 remainder 1

117 ÷ 5 = 23 remainder 2

23 ÷ 5 = 4 remainder 3

4 ÷ 5 = 0 remainder 4

2414₆ = 43234₅.

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Answer:

Step-by-step explanation:

Answer: Percentage of half board students in college is 60%

Step-by-step explanation:

We know that percentage of desired quantity is:

n% = ( number of desired quantity / total number of quantity ) * 100

n% = ( n / N ) * 100  .......... (i)

where n% = percentage of desired quantity.

N = total number of quantity.

n = number of desired quantity.

Now, as per the question:

Half board students in college = 372

Total students in college = 620

percentage of Half board students in college = (372/620) * 100

n% = (372/620)*100

n% = 60%

Therefore, at 372 half board students in college , percentage of half board students in college is 60%.

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The maximum possible height of the bag is 11.51 cm to the nearest centimeter.

 The surface area of ​​a cylinder is defined as the sum of the surface area of ​​the curved surface and the area of ​​the two rounded bases of the cylinder.  Area of ​​cylinder = convex area of ​​circular bases. SA. (π) = 2πr (h +r) square unit. Where π (Pi) = 3.142 or = 22/7. r = radius of the cylinder.  

The surface area of ​​the cylinder is given by the following formula:

SA = 2πrh + 2πr²

where r is the base radius, h is the height, and π is a constant approximately equal to 3.14.

 Since the diameter of the bag is 36 cm, the radius is half  that, ie. 18 cm.

We know that the maximum amount of material  is 1.3 M². This means that the surface area (SA) of the cylinder must be less than or equal to 1.3 M²:

2πrh + 2πr² ≤ 1.3M²

We can rearrange this equation to solve for h:

h ≤ (1.3M² - 2πr²) / (2πr)

Substitute the values ​​of r and π:

h ≤ (1.3M² – 2π(18cm)²) / (2π(18cm))

h ≤ (1.3M² – 2π(324cm²)) / (36π)

h ≤ (1.3M² – 648π) / (36π)

h ≤ 11.51 cm

Therefore, the maximum possible height of the bag is 11.51 cm to the nearest centimeter.

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Yes, larger sample sizes do increase the certainty of a statistical test. This is because as the sample size increases, the sample becomes more representative of the population, leading to more accurate results.

larger sample sizes generally increase the certainty of the statistical test. This is because larger samples provide more information and reduce the likelihood of chance variations affecting the results. The estimated parameter becomes more stable and accurate with a larger sample size. Additionally, larger sample sizes allow for the detection of smaller effect sizes and greater statistical power. However, it is important to note that sample size alone does not guarantee the validity of the statistical test. Other factors such as sampling methods, data quality, and appropriate statistical analysis must also be considered.
Yes, larger sample sizes do increase the certainty of a statistical test. This is because as the sample size increases, the sample becomes more representative of the population, leading to more accurate results. Additionally, larger sample sizes decrease the margin of error and increase the statistical test's power, allowing for better detection of true differences or relationships in the population. Overall, larger sample sizes lead to more reliable and valid conclusions in statistical tests.

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Answer: 27 out of 65%

Answer:

Let c be the number of children and a be the number of adults.

1.75c + 2.25a = 1,180->1.75c + 2.25a = 1,180

c + a = 574->1.75c + 1.75a = 1,004.5

-------------------------------

.5a = 175.5

a = 351, so c = 223

So there were 351 adults and 223 children that day.

The R200 Jacob is paid per day, working three days per week,  and the amount Mr Nkosi paid to the UIF, evaluated using percentages indicates;

a) R31,200

b) 2%

c) Jacob does not have to contribute to the UIF

A percentage is a representation of a ratio of numbers or proportion of a quantity expressed as a fraction of 100.

The number of days Jacob works per week for Mr Nkosi at his playschool for pre-school = Three days per week

The amount

The amount Jacob is paid per day = R200

Amount Mr Nkosi paid to the UIF for one year in advance regarding Jacob = R624

a) Jacob's gross salary in a year = 52 × 3 × R200 = R31,200

b) The percentage R624 is of Jacob's gross salary = (R624/R31,200) × 100 = 2%

c) The amount Mr Nkosi has to contribute to the UIF regarding Jacob in a year is two percent (2%) of Jacob's gross salary, therefore;

Jacob does not have to contribute to the UIF

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The area of the composite solid is 602.88m²

A composite solid is a solid that is composed, or made up of, two or more solids.

The solid consist of two cones. one big and one small cone

Area of a cone can be expressed as;

A = πr² + πrl

A = πr(r+l)

For the Big cone

A = πr(r+l)

A = 3.14 × 8 ( 8+10)

A = 25.12 × 18

A = 452.16m²

Area of the small cone

A = 3.14 × 4( 4 + 8)

A = 12.56 × 12

A = 150.72m²

Therefore the area of the composite solid

= 452.16 + 150.72

= 602.88 m²

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The surface area of the pyramid is 112 square inches if the perimeter of the base of a square pyramid is 32 inches. Thus, option A is correct.

The perimeter of a square pyramid = 32 inches

The height of a square pyramid = 3 inches

If the perimeter is 32 inches, then the sum of the lengths of all four sides is 32 inches.

Length of side= 4s = 32

Length of side = 8 inches

Area of square = [tex]a^{2}[/tex] = [tex]8^{2}[/tex] = [tex]64 inch^{2}[/tex]

Area of triangle =  (1/2) x base x height

Area of triangle = (1/2) x (8) x (3)

Area of triangle  = [tex]12 in^2[/tex]

The total area of four triangles is calculated by:

Total area of triangle = 4 x (12) = [tex]48 in^2[/tex]

The total surface area of the pyramid =  area of square + Area of triangle The total surface area of the pyramid  = 64 + 48 = 112 in^2

Therefore, we can conclude that the surface area of the pyramid is 112 square inches.

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The complete question is:

The perimeter of the base of a square pyramid is 32 inches. The height of the pyramid is 3 inches. What is the surface area of the pyramid?

Responses

a. 112 in°

b. 96 in²

c. 144 in²

d. 72 in²