Finx X: 7x=35

A) 3
B) 5
C) 7
D) 10

Answer:

A

Step-by-step explanation:

A trail would consist of three random digits.

The problem asks for the probability that it will take at least a sample of four to find one person with brown hair. This implies that the first three people do not have brown hair. Therefore, a trial would consist of three random digits. A success is none of the three digits are 0, 1, 2, or 3. For example, 675 would be a success and a failure would be 792.

Answer:

A

Step-by-step explanation:

USA testprep said...

A trail would consist of three random digits.

The problem asks for the probability that it will take at least a sample of four to find one person with brown hair. This implies that the first three people do not have brown hair. Therefore, a trial would consist of three random digits. A success is none of the three digits are 0, 1, 2, or 3. For example, 675 would be a success and a failure would be 792.

Answer:

The above definition of Population & Community of species is correct.

Step-by-step explanation:

Population is the group of organisms living together in same geographical area, at a point of time. Community is the group of all organisms living together in same geographical area, at a point of time.

Population is the smaller group of interbreeding individuals of same species, Community is a bigger group of different species sharing same geographical area.

Eg : Lions in a particular forest can be defined as 'population' ; & all the organisms in a particular forest can be defined as 'community'.

Answer:

A skeleton that has lost 50% of its carbon-14 is 5750 years old.

Step-by-step explanation:

The halflife on an element is the amount it takes to decrease to half it's original amount, that is, when the amount is 50% of the initial amount.

How old is a skeleton that has lost 50% of its carbon-14?

If the skeleton lost 50% of its carbon-14 it has the other 50%, that is, it is in it's half-life.

The radioactive element carbon-14 has a half-life of 5750 years.

This means that a skeleton that has lost 50% of its carbon-14 is 5750 years old.

A skeleton that has lost 50% of its carbon-14 is 5,730 years old, which corresponds to one half-life of carbon-14 (C-14).

The age of a skeleton that has lost 50% of its carbon-14 can be determined using carbon-14 dating. Since the half-life of carbon-14 (¹⁴C) is 5,730 years, if a skeleton has only 50% of the original carbon-14 remaining, it would mean that one half-life has passed. Therefore, the skeleton would be 5,730 years old. Carbon-14 dating measures the radioactive decay of ¹⁴C in formerly living matter to estimate its age. This method is effective for dating biological tissues up to about 50,000 to 60,000 years old.

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To determine the minimum sample size needed to estimate the population proportion, and the minimum sample size needed, assuming no prior information is available, is approximately 6636.

To determine the minimum sample size needed to estimate the population proportion, we can use this formula: [tex]n = (Z^2 * p * (1-p)) / E^2.[/tex]

Where:

By plugging in the values into the formula, we get:

[tex]n = (2.58^2 * 0.5 * (1-0.5)) / 0.02^2[/tex]

= 6635.44

Similarly, a prior study found that 38% of the respondents think the president can control the price of gasoline, which is 9448.7 The sample size needed when using the prior estimate (9449) is larger than when assuming no prior information (6636). This is because having a prior estimate reduces the uncertainty, which allows for a smaller sample size to achieve the same level of confidence and margin of error.

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Final answer:

The minimum sample size needed for estimating the population proportion depends on the desired confidence level, margin of error, and estimated proportion. The formula used is n = (Z^2 * p * (1-p)) / E^2, and without prior estimate, p is taken as 0.5, whereas using a prior study, the actual estimate from the study is used.

Explanation:

To calculate the minimum sample size needed to estimate the population proportion with certain confidence and precision, we use the following formula for sample size calculation:

n = (Z^2 * p * (1-p)) / E^2

Where:

n is the sample size

Z is the Z-score corresponding to the desired confidence level

p is the estimated proportion of the population (p-hat)

E is the margin of error

(a) Without preliminary estimate: Assuming that no prior information is available, we use p = 0.5 for the most conservative sample size estimate. For a 99% confidence level, the Z-score is approximately 2.576. With a margin of error E of 0.02, the formula becomes:

n = (2.576^2 * 0.5 * (1-0.5)) / 0.02^2

(b) Using a prior study: If a prior study found p = 0.38, the calculation uses this value. The formula with Z = 2.576 and E = 0.02 becomes:

n = (2.576^2 * 0.38 * (1-0.38)) / 0.02^2

(c) Comparing results: Using p = 0.5 in (a) will result in a larger sample size than using p = 0.38 in (b) because the variance (p * (1-p)) is maximized when p = 0.5.

Answer:1/2

Step-by-step explanation: i dont really have a explanation but its right

Step-by-step explanation:

uhhh link an image please?

Answer: 11 1/3

Dhdgdhdhd

To find the rate at which the area of the rectangle decreases as its length changes, use the formula for the area of a rectangle and evaluate the area at the two lengths. Then, calculate the average rate of decrease by taking the change in an area divided by the change in length.

The problem involves understanding the properties of rectangles and how the changes in one dimension (length in this case) can affect another (area). Let's consider a rectangle with a perimeter of 35 cm. If 'L' is the length and 'W' is the width, the perimeter = 2*(L+W) which equals 35 cm.

Next, we figure out that W= 17.5 - L as we isolate W in the equation. The area of the rectangle is then given by A = L * W = L * (17.5 - L). If we plug in L = 13 cm and L = 16 cm, we get two area values. The decrease in area ΔA = A2 - A1.

Finally, the average rate of change, or the rate at which the area decreases, as the length goes from 13 cm to 16 cm is calculated by ΔA / ΔL.

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Answer:

D. Euler Circuit.

Step-by-step explanation:

An Euler Circuit goes through every edge exactly once; starts and stops at the same vertex.

According to the Euler's Theorem, A graph has an Euler path if there are two 2-degree vertices without odd degrees and all other vertices have even degrees.

Mathematically, it is given as;

V+F=2-E

where;

F is the number of faces

V the number of vertices

E the number of edges.

Final answer:

An Euler Path traverses every edge of a graph exactly once and can start and end at different vertices, fitting the student's question.

Explanation:

The student's question hints at two different types of paths in graph theory: the Euler Path and the Hamiltonian Path. An Euler Path goes through every edge exactly once and can start and stop at different vertices. This path doesn't have to cover all vertices, but it must include every edge.

Here's a breakdown of the terms:

Hamiltonian Path: A path that visits every vertex exactly once, but it may start and end at different vertices.

Hamiltonian Circuit: A path that visits every vertex exactly once and starts and ends at the same vertex (creating a cycle).

Euler Path: A path that uses every edge exactly once, but it may start and end at different vertices.

Euler Circuit: A path that uses every edge exactly once and starts and ends at the same vertex (creating a cycle).

On the other hand, a Hamiltonian Path also goes through every vertex exactly once, but it is not concerned with edges.

In this case, since the definition provided in the question states the requirement is about edges and not vertices, the correct answer is c. Euler Path.

Answer:

C

Step-by-step explanation:

Answer:

C. 24 degrees

Step-by-step explanation:

The 3 angles inside ∠ABE: ∠ABC,∠DBC and∠EBD must add to 126 degrees

∠ABC+∠DBC+∠EBD =126

We already know that ∠DBC is 30 degrees, and ∠EBD is 72 degrees, so we can substitute them in

∠ABC+30+72=126

Combine like terms

∠ABC+102=126

Subtract 102 from both sides

∠ABC=24

So, ∠ABC equals 24 degrees, and C is the correct choice

Exact answer = 64 - 16pi

Approximate answer = 13.7345175425633

Units for the area are in square inches.

==============================================================

Work Shown:

The radius of each circle is 2 inches. Double this value to get the diameter to be 4 inches.

Two circles along the top have their diameters combine to 8 inches total, which is the side length of the square.

The area of the entire square, before we subtract off the circles, is 8^2 = 64 square inches.

Let A = 64

The area of one circle is pi*r^2 = pi*2^2 = 4pi square inches. Four circles combine to an area of 4*4pi = 16pi square inches.

Let B = 16pi

Subtract A and B to get the area of the shaded region, which is the leftover area after subtracting off the four circles

A-B = 64-16pi

To get the approximate answer, use a calculator

64-16pi = 13.7345175425633

Answer:

50.625

Step-by-step explanation:

1) 10/2=5

10+5= 15

2) 15/2 = 7.5

15+7.5 = 22.5

3) 22.5/2 = 11.25

22.5+11.25= 33.75

4) Answer:  33.75/2 = 16.875

33.75+16.875 = 50.625

Answer:

0.256 or 0.26

Step-by-step explanation:

The common ration is being multiply by 0.4

Para llenar la piscina en 3 horas, serían necesarios 8 grifos. Se aplica la regla de tres inversa: si aumentamos los grifos, disminuirá el tiempo requerido.

Esta pregunta se resuelve aplicando la regla de tres inversa. Si cuatro grifos tardan seis horas en llenar la piscina, para llenarla en la mitad de tiempo (3 horas), serán necesarios el doble de grifos.

La regla de tres inversa señala que si aumentamos la cantidad de grifos, disminuirá el tiempo requerido para llenar la piscina y viceversa. En este caso, como queremos reducir el tiempo a la mitad, necesitaremos el doble de grifos. Entonces, necesitaremos 4 * 2 = 8 grifos para llenar la piscina en 3 horas.

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The unknown number was found from the equation to be -30.

An equation is an expression used to show the relationship between two or more variables and numbers.

Let x represent the unknown number. Two thirds of a number is negative Twenty, hence:

(2/3)x = -20

Multiply both sides of the equation by 3/2, hence:

(2/3)x * 3/2 = -20 * 3/2

x = -30

The unknown number was found from the equation to be -30.

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Answer:d

Step-by-step explanation:

Clearly from observation option D is the exponential sequence

256,64,16,4 is decreasing exponential function

[tex]\Rightarrow \frac{256}{64}=\frac{4^4}{4^3}=4[/tex]

[tex]\Rightarrow \frac{64}{16}=4[/tex]

for other option they simply follow an AP

2,6,10,14,18

common difference d=4

Answer: She bought about 150 markers.

Step-by-step explanation:

Given : A teacher bought 15 boxes of markers.

i.e. Total boxes of markers = 15

Each box contained 8 markers.

That is , the estimated number of markers in each box = 10 [∵ 8≈10 [Round to the nearest tens]]

Now , the total number of markers in all 15 boxes of markers = (15) x (10)

= 150

Hence, she bought about 150 markers.

Answer:

  $3.85 per ounce

Step-by-step explanation:

If we assume that all of the purchased ingredients are used in a mixture, their total cost is ...

  3(4.03) +2(3.42) +4(3.92) = 34.61

The total quantity of mix is ...

  3 + 2 + 4 = 9 . . . ounces

Then the cost per ounce is ...

  $34.61/(9 oz) ≈ $3.85 /oz

The cost per ounce of the perfume that Charlene and Gary made is $3.85. This is calculated by adding the total cost of each ingredient and dividing by the total quantity of all ingredients.

To find the cost per ounce of the perfume that Charlene and Gary wish to make, you need to determine the total cost of all the ingredients first, then divide by the total quantity of the perfume produced.

First, calculate the total cost of each ingredient:

Total cost is thus $12.09 + $6.84 + $15.68 = $34.61.

The total quantity of the perfume is 3 ounces (rose oil) + 2 ounces (ginger essence) + 4 ounces (black currant essence) = 9 ounces.

Therefore, the cost per ounce of the perfume is $34.61 / 9 ounces = $3.85 per ounce (rounded to the nearest cent).

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Answer:

slope = 5/2

Step-by-step explanation:

This equation is written in slope intercept form

y = mx+b where m is the slope and b is the y intercept

y = 5/2x -3

The slope is 5/2 and the y intercept is -3

Answer:

Slope: 5/2

Y Intercept: -3

Step-by-step explanation:

Answer:

one angle is 150 degrees and the other is 30 degrees.

Step-by-step explanation:

please kindly check the attached file for explanation.

Answer:

I think, one angle is 150 and the other 30.

Step-by-step explanation:

First, you can make a table of 3 columns: Angle 1, Angle 2 and Total

Then, you will work with the ratio 5:1 and say

Angle 1    Angle 2     Total

5               1                 6

Then you do a little algebra process like this:

6a=180

6 x a /6= 180 / 2

a=30

6a=180

6 x a / 6=180/2    This means 6 times a divided by 6= 180 divided by 2. We insolate the variable, and we cross out the two six

a=30 And our answer is 30.

You can choose any variable. In this case I did with the variable a since we are talking about angles.

Returning to the table, the thing we need to do is this:

Angle 1    Angle 2     Total

5               1                 6

150          30               180

We need to multiply 5x30 and 1x30

Then we add 150 plus 30 is 180.

So one angle is 150 and the other 30.

Hope this helps.

Answer:

144=2x2x2x2x3x3

Step-by-step explanation:

Answer:

[tex]2^4\cdot3^2[/tex]

Step-by-step explanation:

The first step is to break this down. 144=12^2 or 12*12. Now you can break down 12. 12=4*3=2*2*3. This means that 144=2*2*3*2*2*3=[tex]2^4\cdot3^2[/tex]. Hope this helps!

Answer:

Volume: [tex]\frac{2}{3}\pi r^3[/tex]

Ratio: [tex]\frac{2}{9}r[/tex]

Step-by-step explanation:

First of all, we need to find the volume of the hemispherical tank.

The volume of a sphere is given by:

[tex]V=\frac{4}{3}\pi r^3[/tex]

where

r is the radius of the sphere

V is the volume

Here, we have a hemispherical tank: a hemisphere is exactly a sphere cut in a half, so its volume is half that of the sphere:

[tex]V'=\frac{V}{2}=\frac{\frac{4}{3}\pi r^3}{2}=\frac{2}{3}\pi r^3[/tex]

Now we want to find the ratio between the volume of the hemisphere and its surface area.

The surface area of a sphere is

[tex]A=4 \pi r^2[/tex]

For a hemisphere, the area of the curved part of the surface is therefore half of this value, so [tex]2\pi r^2[/tex]. Moreover, we have to add the surface of the base, which is [tex]\pi r^2[/tex]. So the total surface area of the hemispherical tank is

[tex]A'=2\pi r^2 + \pi r^2 = 3 \pi r^2[/tex]

Therefore, the ratio betwen the volume and the surface area of the hemisphere is

[tex]\frac{V'}{A'}=\frac{\frac{2}{3}\pi r^3}{3\pi r^2}=\frac{2}{9}r[/tex]

V= (3.14)x(2²)x(24)= 301.592 ft³

Answer:

96π ft^3 or  301.59 ft^3 to the nearest hundredth.

Step-by-step explanation:

Volume =  π r^2 L         (r = radius L = length).

=  π * 2^2 * 24

= 96π ft^3.

Anwer:12

Step-by-step explanation:

Answer:

24

Step-by-step explanation:

1 dozen= 12

12x2=24

Answer:

m = 3/4

Step-by-step explanation:

12.6 + 4m = 9.6 + 8m

4m - 8m = 9.6 - 12.6

- 4m = - 3

- m = - 3/4

m = 3/4

Answer:

Step-by-step explanation:

the length of the smallest side is 4 inches.

the length of the middle side is 8 inches.

the length of the longest side is 12 inches.

Step-by-step explanation:

Let x represent the length of the middle side of the triangle.

The longest side is 4 more than the middle side. It means that the length of the middle side is x + 4.

The smallest side is half the length of middle side. It means that the length of the smallest side is

x/2

The formula for determining the perimeter of a triangle is

Perimeter = a + b + c

Where a, b and c are the lengths of each side of the triangle. The perimeter of the triangle is 24 inches. It means that

x + 4 + x + x/2 = 24

Multiplying both sides of the equation by 2, it becomes

2x + 8 + 2x + x = 48

5x = 48 - 8

5x = 40

x = 40/5

x = 8 inches

The length of the longest side is

8 + 4 = 12 inches

The length of the smallest side is

8/2 = 4 inches

Answer:

3 miles

Step-by-step explanation:

The circumference of a circle can be found using:

c=[tex]\pi d[/tex]

We know the circumference is [tex]3\pi[/tex], so we can substitute that in for c

[tex]3\pi[/tex]=[tex]\pi d[/tex]

We want to find the diameter. To do this, we need to get d by itself. It is being multiplied by pi. To undo this, divide both sides by pi. This will cancel pi, and leave d by itself.

[tex]3\pi /\pi =\pi d/ \pi[/tex]

3=d

So, the diameter is 3 miles

Answer:

Diameter is 3

Step-by-step explanation:

C=2πr

3π = 2πr

3π / 2π = r  (Divide each side by 2π)

3/2 = r   (Simplify π)

3/2 *2 = d  (d = 2r)

d = 6/2 = 3

[tex]8y - 72 = 8 \times y - 8 \times 9 = \\ = 8 \times (y - 9) = 8(y - 9)[/tex]

Answer:

46.5

Step-by-step explanation:

Answer:

there are infinite many solutions.

Step-by-step explanation:

i have taken this before

Answer:

D

Step-by-step explanation: