Please answer the question correctly my test is due in 30 mins please help

Step-by-step explanation:

to select 3 out of 13.

no repetition, and the sequence of the selected items does not matter.

that means combinations :

C(13, 3) = 13! / (3! × (13 - 3)!) = 13! /(3! × 10!) =

= 13×12×11 / (3×2) = 13×2×11 = 286

there can be 286 different random samples of size 3.

The answer is 286.

The number of different simple random samples of size 3 that can be selected from a population consisting of 13 items is 286.Explanation:Simple random sampling is a statistical technique used in research. In this sampling method, a subset of a population is selected randomly, with each member of the population having an equal chance of being selected. There are different types of random sampling methods, such as systematic sampling, stratified sampling, cluster sampling, etc.The number of different simple random samples of size k that can be selected from a population of size N is given by the formula N!/k!(N-k)!, where ! denotes factorial. Here, the population consists of 13 items, and we need to find the number of different simple random samples of size 3 that can be selected from this population.So, the required number of different simple random samples of size 3 that can be selected from this population is 13!/3!(13-3)! = 286.

Therefore, the number of different simple random samples of size 3 that can be selected from a population consisting of 13 items is 286.

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Answer:

Solving for the unknown variable:

cosθ = sinθ

Dividing both sides by cosθ, we get:

tanθ = 1

Taking the inverse tangent of both sides, we get:

θ = π/4 + nπ, where n is an integer.

Therefore, the exact general solution is:

θ = π/4 + nπ, where n is an integer.

1 + sinθ = 2cos^2 (θ)

Using the identity cos^2 (θ) + sin^2 (θ) = 1, we can rewrite the equation as:

1 + sinθ = 2(1 - sin^2 (θ))

Expanding the right-hand side, we get:

1 + sinθ = 2 - 2sin^2 (θ)

Rearranging, we get:

2sin^2 (θ) + sinθ - 1 = 0

Using the quadratic formula, we get:

sinθ = (-1 ± √5)/4

Taking the inverse sine of both solutions, we get:

θ = arcsin [(-1 ± √5)/4] + 2nπ or π - arcsin [(-1 ± √5)/4] + 2nπ, where n is an integer.

Therefore, the exact general solution is:

θ = arcsin [(-1 ± √5)/4] + 2nπ or π - arcsin [(-1 ± √5)/4] + 2nπ, where n is an integer.

sin3θ = -1

Taking the inverse sine of both sides, we get:

3θ = (-1)^n (π/2) + 2nπ, where n is an integer.

Dividing both sides by 3, we get:

θ = (-1)^n (π/6) + (2nπ)/3, where n is an integer.

Therefore, the exact general solution is:

θ = (-1)^n (π/6) + (2nπ)/3, where n is an integer.

Step-by-step explanation:

Let the principal deposited by Ram at the age of 16 be P.

After the balance became 121/700 times of the initial principal, we have:

(121/700)P = P(1 + 10/100)^n

where n is the number of years for which the amount is compounded annually.

Simplifying the above equation, we get:

n = log(121/700)/log(1.1)

After Ram deposited 1/70 of the existing balance, his new balance became:

(121/700)P + (1/70)[(121/700)P] = (121/700)P(1 + 1/10)

After 1 year of this deposit, the new balance became:

(121/700)P*(1 + 1/10)(1 + 20/100) = (121/700)P(11/10)*(6/5) = (363/350)P

Given that this amount is Rs. 359 less than thrice of the initial principal, we get:

(363/350)P = 3P - 359

=> P = Rs. 2450

Therefore, the sum deposited by Ram at the age of 16 years was Rs. 2450.

The loan amount borrowed by Ram from the bank is Rs. 1,10,000 at a rate of 15% p.a. compounded annually for 4 years. Let the interest paid by Ram at the end of the 1st year be I1.

The amount to be paid by Ram at the end of the 1st year = 1,10,000*(1 + 15/100) = Rs. 1,26,500

Out of this, Ram pays only the interest amount, i.e., I1.

The remaining amount to be paid by Ram after the 1st year = 1,26,500 - I1

This amount is to be paid in 3 years, at a rate of 15% p.a. compounded annually.

Let the equal installments to be paid by Ram for the next 3 years be X.

Therefore, we have:

X*(1 + 15/100)^3 + X*(1 + 15/100)^2 + X*(1 + 15/100) = 1,26,500 - I1

Solving the above equation, we get:

X = Rs. 36,285.47

Therefore, the total interest paid by Ram to the bank is:

I1 + 3X - 1,10,000 = I1 + 336,285.47 - 1,10,000 = Rs. 59,856.41

To avoid borrowing an extra loan, the withdrawn amount should be equal to or greater than the amount required to start the business.

The withdrawn amount is given by:

3P - 359 = 3*2450 - 359 = Rs. 6891

Therefore, Ram should have waited for the amount in his bank account to become Rs. 6891 or more, which would take n years, where:

(121/700)2450(1 + 10/100)^n >= 6891

Solving the above equation, we get:

n >= 4.52

Therefore, Ram should have waited for at least 5 years to start the business, to avoid borrowing an extra loan.

The strengthening of National Ambient Air Quality Standards for maximum daily concentration of PM2.5 from 65 micrograms to 35 micrograms is expected to have a positive impact on public health.

The PM2.5 is defined as a fine particulate matter which penetrate deep into the lungs and cause a range of health problems, including asthma attacks, heart disease, and lung cancer.

By lowering the maximum daily concentration of PM2.5, the EPA is aiming to reduce the amount of air-pollution that people are exposed to, which should lead to improvements in public health.

Therefore, the strengthening of the National Ambient Air Quality Standards for PM2.5 is a positive step towards protecting public health and reducing the burden on medical facilities.

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Step-by-step explanation:

The volume of a cone is given by the formula (1/3)πr^2h, where r is the radius of the base and h is the height. So, the volume of the cone is:

V_cone = (1/3)π(2 ft)^2(3 ft)

V_cone = (4/3)π ft^3

The volume of a cylinder is given by the formula πr^2h, where r is the radius of the base and h is the height. So, the volume of the cylinder is:

V_cylinder = π(2 ft)^2(10 ft)

V_cylinder = 40π ft^3

To find the total volume, we add the volumes of the cone and cylinder:

V_total = V_cone + V_cylinder

V_total = (4/3)π + 40π

V_total = 133.2 ft^3

Rounding off the answer to the nearest tenth of a cubic foot, the total volume is approximately 133.2 ft^3.

Answer: 138.23 ft³

Step-by-step explanation:

V = V of Cylinder + V of Cone

V of Cylinder = πr^2h

V of Cylinder = (2)^2 x 10 x π

V of Cylinder = 40π

V of Cone = πr^2(h/3)

V of Cone = π x (2)^2 x 3/3

V of Cone = π x 4 x 1

V of Cone = 4π

Total V = 40π + 4π

Total V = 138.23 ft³

The simplified expression is (7/4)a - 11.

What is simplification?

Exam scores are improved by simplifying mathematical problems, which is also used in everyday life to get discounts in malls of up to 35%, flat discounts, or 20% for purchases up to Rs. 100. In this section, you only need to use the basic simplification principles to solve equations.

Therefore, simplifying an expression entails using various techniques to transform it into a simpler variant. The actions needed to reduce things are carried out in a predetermined sequence known as BODMAS.

To simplify the expression, we can start by distributing the coefficients to the terms inside the parentheses:

3/4(5a - 16) - 1/3(6a - 3)

= (3/4 * 5a) - (3/4 * 16) - (1/3 * 6a) + (1/3 * 3)

= (15/4)a - 12 - 2a + 1

= (15/4)a - 2a - 11

= (7/4)a - 11

Therefore, the simplified expression is (7/4)a - 11.

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Answer:21 tree cards

Step-by-step explanation:

Formula given for surface area of cylinder A=2πr² + 2πrh, where r is the radius and h is the height of the cylinder and its factorised form is A=2πr(r+h).

What is cylinder?

Cylinder is a three dimensional solid containing three faces, of which two are flat circles and third face is the curved face. The volume or space occupied by this solid is given by πr²h. And its curved surface area is given by 2πrh. The total surface area of this solidis the sum of areas of all three faces which is given by 2πr² + 2πrh.

Given that, surface area of cylinder is A=2πr² + 2πrh

To factorise any given expression or equation, we find the factors of the each terms.

1st term=2πr²

factors of 1st term= 2 × π × r × r

2nd term= 2πrh

factors of 2nd term=  2 × π × r × h

Next, find the common factors from these terms

common factors or highest common factors of 1st and 2nd term=2 × π × r

The highest common factors are written outside the brackets & the remaining terms inside the brackets.

A=2πr² + 2πrh

  =2 × π × r (r + h)

  =2 π r (r + h)

A=2 π r (r + h) is the factorised form of the surface area of cylinder.

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Elizabeth's statement is incorrect because she didn't divide the inequality by 6 to isolate x.

To find the correct values of x that make the inequality true, we can solve the inequality:

6x < 42

Divide both sides by 6:

x < 7

Now, we can describe in words all values of x that make the inequality true:

Any value of x less than 7 makes the inequality 6x < 42 true.

For example, x = 5

6 x 5 < 42

30 < 42

This is therefore true.

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Answer:

-8 - 1 - 2 = -9 - 3 is not an equal expression because when both sides are simplified you get -12 from -9-3 and -11 from -8-1-2.    (-11)≠(-12)

Step-by-step explanation:

If you are confused with subtracting negatives from negatives there is an equal trick which can make it seem a lot more easier. Basically instead of viewing it as -9-3, you can look at it was -9+(-3). Both of these problems are the same thing, but by just adding the + in the middle makes it seem a lot more easier to interpret. Hope this helps.

Answer:

Step-by-step explanation:

Given: d= 12 and h= 14

formula for the volume of a cone:

V= (1/3) · π · r² · h

V= volume

r= radius

h= height

to find the radius of the cone, we will use this formula r = 1/2 · d

r = 1/2 · 12

r = 6

Now that we know the value of the radius we can now plug it in in our formula.

V= (1/3) · π · 6² · 14

V= 1π · 6² · 14 / 3

V= 1π · 2²· 3² · 14 / 3

V= 2² · 14 · 3π

V= 2² · 14 · 3π

V= 2² · 42π

V= 4 · 42π

V= 168π

V=527.79

Hope this helps =D

The map is scaled at 3 in. to 2 km. Therefore , 3 inches on the map correspond to 2 kilometres in actual distance between two tourist.

A scale is a group of figures—numbers, amounts, etc.—used to gauge or contrast an object's level. A scale in maps refers to the relationship between an object's actual size and its size on a map, model, or diagram.

We can use the following ratio to determine the real separation between the two tourist attractions:

"2 kilometers / 3 inches= kilometers /× 5  3/4 inches"

where x is the actual separation between the two attractions for tourists.

To find x, we can cross-multiply:

`3× x = (5 + 3/4× 2`)

`3x = 11.5`

`x = 11.5 / 3`

`x = 3.83 km`  

The actual distance between the two tourist destinations is 3.83 kilometers

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.

The correct answer is wider confidence intervals.

In statistics, a confidence interval is a range of values that is likely to contain the true population parameter with a certain degree of confidence. The level of confidence is typically set at 90%, 95%, or 99%, and represents the percentage of intervals that would contain the true parameter if we were to repeat the sampling process many times.

Higher levels of confidence mean that we are more certain that the true parameter falls within the interval. However, achieving higher levels of confidence requires larger sample sizes or larger standard errors, which in turn leads to wider confidence intervals.

To understand this, consider the formula for a confidence interval:

CI = point estimate ± margin of error

The margin of error is a function of the sample size and the standard error. As the sample size increases or the standard error decreases, the margin of error decreases, which leads to a narrower confidence interval. Conversely, if we want to increase the level of confidence, we need to increase the margin of error, which requires either a larger sample size or a larger standard error, leading to wider confidence intervals.

Therefore, higher levels of confidence generally require wider confidence intervals, which means we are less precise in our estimate but more certain that the true parameter falls within the interval.

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Answer:

[tex]y=-2x+9[/tex]

Step-by-step explanation:

Perpendicular lines have slopes that are negative reciprocals of each other, so the line we need to find has a slope of [tex]-2[/tex].

Using point-slope form,

[tex]y+7=-2(x-8) \\ \\ y+7=-2x+16 \\ \\ y=-2x+9[/tex]

the ramp gets further away from the step, the angle it has with the ground decreases.

θ = [tex]tan^{-1}[/tex](0.515 / (48 + x))

Assuming that the ramp remains the same height as the step, we can use trigonometry to find the angle that the ramp would make with the ground if it starts farther away from the step.

First, let's convert the distance from feet to inches, since the height of the step is given in inches: 4 feet = 48 inches.

Next, we can use the tangent function to find the angle theta:

tan(θ) = opposite / adjacent

where opposite is the height of the step (5 inches) and adjacent is the horizontal distance from the base of the step to the point where the ramp meets the ground (48 inches * tan(5.9°) = 5.514 inches).

So, tan(θ) = 5 / 5.514, which gives us θ = 41.2°.

Now, let's say the ramp starts at a distance x from the base of the step. We can use the same formula, but with a different value for adjacent:

tan(θ) = 5 / (48 + x) * tan(5.9°)

We can simplify this expression by substituting the value of tan(5.9°) as approximately 0.1032:

tan(θ) = 0.515 / (48 + x)

Solving for theta, we get:

θ = [tex]tan^{-1}[/tex](0.515 / (48 + x))

As a result, we can see that the denominator of the fraction within the arctan function gets larger as x increases (i.e., the ramp starts further from the step), resulting in a smaller fraction and, consequently, a smaller angle theta. To put it another way, as the ramp gets further away from the step, the angle it has with the ground decreases.

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The probability of 12 power failures occurring in a semester is approximately 0.065 or 6.5%.

To calculate the probability of 12 power failures occurring in a semester, we need to use the Poisson distribution, which models the number of events that occur in a fixed interval of time or space.

The Poisson distribution is appropriate when the events occur randomly and independently, and the rate of occurrence is constant.

The Poisson distribution has a single parameter, lambda (λ), which represents the mean and variance of the distribution. In this case, λ = 2 power failures per month * 6 months in a semester = 12 power failures per semester.

Using the Poisson probability mass function, we can calculate the probability of exactly 12 power failures in a semester:

P(X = 12) = (e^(-λ) * λ^12) / 12!

= (e^(-12) * 12^12) / 12!

≈ 0.065

This means that in a large number of semesters, we would expect to observe 12 power failures in about 6.5% of them.

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Raven bought 1/3 kg of turkey ham, and Chisa bought 2/9 kg less. The total amount of turkey ham they bought together is 1/3 + 1/9 = 3/9 + 1/9 = 4/9 kg. Together, they bought a total of 4/9 kg of turkey ham.

A fraction is a mathematical symbol that represents a portion of a whole or a component of a number. It is made up of two numbers divided by a horizontal line, with the number above the line (numerator) indicating the portion under consideration and the number below the line (denominator) indicating the entire or the total number of equal parts in the whole.

From the given information, we know that Raven bought 1/3 kg of turkey ham, and Chisa bought 2/9 kg less than Raven. This means that Chisa bought:

1/3 kg - 2/9 kg = 3/9 kg - 2/9 kg = 1/9 kg

Now we can find the total amount of turkey ham they bought together by adding Raven's purchase and Chisa's purchase:

1/3 kg + 1/9 kg = 3/9 kg + 1/9 kg = 4/9 kg

Therefore, Raven and Chisa bought a total of 4/9 kg of turkey ham together.

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The length of the boundary wall that needs to be raised to enclose the entire football stadium is 420 + 40 = 460 meters.

To determine the length of the boundary wall that needs to be raised, we need to know which part of the stadium the wall will enclose.

If the wall is to be raised along the length of the stadium (i.e., the longer side), then the length of the wall will be equal to the length of the stadium, which is 125 meters.

If the wall is to be raised along the width of the stadium (i.e., the shorter side), then the length of the wall will be equal to the width of the stadium, which is 85 meters.

If the wall is to enclose the entire stadium, then we need to find the perimeter of the stadium and add the length of the wall that will enclose the remaining side.

Perimeter of the stadium = 2 x (length + width)

Perimeter of the stadium = 2 x (125 + 85) = 420 meters

To enclose the remaining side, we need to add a wall of length 125 - 85 = 40 meters.

Therefore, the length of the boundary wall that needs to be raised to enclose the entire football stadium is 420 + 40 = 460 meters.

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The value of x as required to be determined in the task content is; 10.7°.

It follows from the task content that the value of x is to be determined from the task content.

Since the given figure is such that the lines MN and MP are tangents to the circle; the assertion which holds is that <MLP and <MNP are supplementary angles.

On this note, it follows that;

73° + x° = 180°.

On this note;

x = 180 - 73

x = 107°.

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Answer:

To find the probability that on two consecutive mornings the person will miss the bus at least one morning, we can use the complement rule. The complement of missing the bus is catching the bus. Therefore, the probability of missing the bus on both mornings is (0.4) x (0.4) = 0.16. The probability of not missing the bus on both mornings is (1 - 0.4) x (1 - 0.4) = 0.36. To find the probability of missing the bus at least one morning, we can subtract the probability of not missing the bus on both mornings from 1: P(missing bus at least once) = 1 - P(not missing bus on both mornings) P(missing bus at least once) = 1 - 0.36 P(missing bus at least once) =

Thus, the theoretical probability (winning the game) when given that when orange marble or yellow marble appears is 1/4.

The concept of probability can be applied to either individual events or relationships between them, including intersection and union, in the field of accounting. Any event's probability value could be between 0 and 1 (or 0% and 100%).

Given data:

probability = favourable outcome  / total outcome

probability (winning the game) --> only when orange marble or yellow marble appears.

Thus,

Total favourable outcome = 1 yellow +  2 orange = 3.

probability (winning the game) = 3/12 = 1/4

Thus, the  theoretical probability (winning the game) when given that when orange marble or yellow marble appears is 1/4.

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Correct question:

A bag has 12 different-colored marbles: 4 green, 5 blue, 1 yellow, and 2 orange. You draw a marble from the bag. If you get an orange marble or yellow marble, you win a prize.

What is the theoretical probability of winning the game?

Answer:

the scale factor used to create the image is 3

Answer:

The answer is 3

Step-by-step explanation:

I took the test and got it right :)

A square-based box with an open top and volume of 4,000 cm³ has minimum surface area when its dimensions are 10√2 cm by 10√2 cm by 20√2 cm.

Let's assume that the box has a square base with side length x and height h. Then, its volume is given by:

V = x^2 * h

We are given that the volume is 4,000 cm³, so we can write:

x^2 * h = 4,000

Solving for h, we get:

h = 4000 / x^2

The amount of material used to construct the box is the sum of the areas of its five faces (four sides and the base). Since the box has an open top, we don't need to consider its area. The area of the base is x^2, and the area of each side is x times the height h. Thus, the total surface area A of the box is given by:

A = x^2 + 4xh

Substituting the expression we found for h, we get:

A = x^2 + 4x(4000 / x^2)

Simplifying and factoring out 4, we get:

A = 4(x^2 + 1000/x)

To find the dimensions of the box that minimize the amount of material used, we need to find the value of x that minimizes A. We can do this by taking the derivative of A with respect to x and setting it equal to zero:

dA/dx = 8x - 4000/x^2 = 0

Solving for x, we get:

x = 10√2

Substituting this value back into the expression we found for h, we get:

h = 20√2

Therefore, the dimensions of the box (in cm) that minimize the amount of material used are:

side length of the base: 10√2 cm

height: 20√2 cm

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Answer: D3 friends equally share 7 peaches​

Step-by-step explanation:
there are 3 1/3 pieces meaning there are 3 friends. Each friend gets 2 so 2x3 = 6 and 1/3 times 3/1 = 1 so 6+1=7

The complete table is :

10          40          12.4          150          360

200       800       248          320          768

In mathematics, a table is a way of organizing and presenting data in rows and columns.

The data is usually numerical or categorical, and the table allows us to compare and analyze the data in a structured way.

Tables can be used to display the results of calculations, record experimental data, or summarize information from surveys or questionnaires.

10x = 40 ×200

10x = 8000

x = 8000/10

x = 800

800x = 40 × 248

x = 12.4

150x = 320 × 360

x = 768

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The standard form for linear equations in two variables is Ax+By=C.

A group of two or more linear equations that you want to solve simultaneously is referred to as a system of linear equations. A combination of numbers that makes every equation true simultaneously is the solution to a system of linear equations.

Systems of linear equations can be solved using a variety of techniques, including substitution, elimination, and graphing.

For example, 2x+3y=5 is a linear equation in standard form.

Utilize it to determine the slope and y-intercept before writing the Slope-intercept form should be used to formulate the equation.

A linear equation can be used to represent a straight line on a graph.. There are several ways to write it, however one of the most used is the slope-intercept form:

y = mx + b

where m denotes the line's slope and b its y-intercept. The difference in y between any two points on a line, divided by the difference in x, is the slope of the line. The line's intersection with the y-axis is known as the y-intercept.

You need to know either two points on the line or the slope and one point on the line in order to form a linear equation. With this knowledge in hand, you may utilize it to determine the slope and y-intercept before writing the Slope-intercept form should be used to formulate the equation.

Complete question is below :

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How do you Writing Linear Equations Using the Slope and Intercept?

Answer:

720 square inches.

Step-by-step explanation:

To find the surface area of a triangular prism, we need to find the area of each face and add them together.

The triangular bases have base 12 in and height 15 in, so the area of each is:

(1/2) × 12 in × 15 in = 90 in²

The rectangular faces have dimensions 20 in × 15 in and 20 in × 12 in, so their areas are:

20 in × 15 in = 300 in²

20 in × 12 in = 240 in²

Adding these up, we get:

2 × 90 in² + 300 in² + 240 in² = 720 in²

the surface area of the triangular prism is 720 square inches.

Answer:

64 units^2

Step-by-step explanation:

The area of a triangle is:

A = 1/2×base×height

For the base, any side can be the base and the corresponding height to go with it has to be perpendicular.

For this question, the left side, 16, will be the base. And the height will be 8.

Area = 1/2bh

= 1/2•16•8

= 64