There were some people on a train.
18 people get off the train at the first stop and 21 people get on the train.
Now there are 65 people on the train.
How many people were on the train to begin with?

Answer:

1) x= 2

Step-by-step explanation:

Answer:

Step-by-step explanation:

To find the volume of a pyramid, we can use the formula:

V = (1/3) * base area * height

First, we need to find the height of the pyramid. To do this, we can draw a diagram of the pyramid and create a right triangle using half a side of the base, the height of the pyramid, and one of the segments connecting the apex to a midpoint of a side of the base.

Using the Pythagorean theorem, we can solve for the height:

h^2 + (14/2)^2 = 25^2

h^2 + 49 = 625

h^2 = 576

h = 24

Now we can find the base area:

Base area = 14^2

Base area = 196

And finally, we can use the formula to find the volume:

V = (1/3) * 196 * 24

V = 1568 cubic units

Therefore, the volume of the pyramid is 1568 cubic units.

The amount in the account after compounded quarterly is found as: $1103.8.

Compounding quarterly is the term used to describe the amount of interest that is earned on a quarterly basis on a savings account or investment at which interest is also reinvested.

Although most banks charge interest income here on deposits, which compounds quarterly, this information is useful in computing the fixed deposit income. It can also be used to figure out any revenue from money market instruments or other financial products that pay quarterly income.

The formula for quarterly compounding:

A = P * [tex](1+r/n)^{nt}[/tex]

P​ $1000​, r​ = 10%, t ​= 2  years;

compounded quarterly : n = 4

A = 1000 * [tex](1+0.10/4)^{4*1}[/tex]

A = 1000 * 1.1038

A = 1103.8

Thus, the amount in the account after compounded quarterly is found as: $1103.8.

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Complete question:

Find the amount in the account for the given​ principal, interest​ rate, time, and compounding period.

P​ $1000​, r​ = 10%, t ​= 2 years; compounded quarterly

the surface area of the given triangular prism with sides of 4in, 5in, 6in, 6in, 8in, and 7in is 146 square inches.

To calculate the surface area of a triangular prism, you need to find the area of each of the faces and add them up.

First, let's find the area of the two triangular faces. To do this, we need to find the base and height of each triangle. Since the prism is isosceles, the base of each triangle is 6 inches (the length of one of the sides of the equilateral triangle). The height of each triangle can be found using the Pythagorean theorem. We have two sides of the triangle: 4 inches and 5 inches. Using the Pythagorean theorem, we can find the height:

[tex]h^2 = 5^2 - 4^2\\h^2 = 25 - 16\\h^2 = 9\\h = 3[/tex]

So the height of each triangular face is 3 inches. Now we can find the area of each triangular face:

Area of one triangular face = (1/2) x base x height

= (1/2) x 6 x 3

= 9 square inches

Since there are two triangular faces, the total area of the triangular faces is:

Total area of triangular faces = 2 x 9 = 18 square inches

Next, let's find the area of the three rectangular faces. We have two rectangles with sides of 6 inches by 8 inches, and one rectangle with sides of 4 inches by 8 inches. The area of each rectangular face is:

Area of rectangular face = length x width

So the area of the rectangular faces are:

Area of rectangular face 1 = 6 x 8 = 48 square inches

Area of rectangular face 2 = 6 x 8 = 48 square inches

Area of rectangular face 3 = 4 x 8 = 32 square inches

Therefore, the total surface area of the triangular prism is:

Total surface area = 18 + 48 + 48 + 32 = 146 square inches

So the surface area of the given triangular prism with sides of 4in, 5in, 6in, 6in, 8in, and 7in is 146 square inches.

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The answer choice that is the most appropriate is B. A one-sample z-interval for estimating a population proportion

This is the most appropriate method because you are trying to estimate the proportion of all registered voters who have a favorable impression of Candidate A based on the sample data.

A one-sample z-interval is used when you want to estimate a population proportion using a sample proportion.

To calculate the one-sample z-interval for estimating a population proportion, you can use the following formula:

Confidence Interval = p ± Z * sqrt((p * (1 - p)) / n)

where:

Using this method, you will calculate a confidence interval that estimates the true proportion of registered voters who have a favorable impression of Candidate A, based on the sample data.

This is the most appropriate method because it focuses on estimating a single population proportion and incorporates the sample data and sample size into the calculation.

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The ratiο οf the time Sam spends wοrking fοr his mοther tο the time he spends wοrking fοr his father per year is 1/6 οr 1:6. Thus, οptiοn D is cοrrect.

The relative size οf twο quantities expressed as the quοtient οf οne divided by the οther; the ratiο οf a tο b is written as a:b οr a/b.

If Sam wοrks fοr his father fοr 2/5 οf the year, then he wοrks fοr his mοther fοr the remaining time, which is 1 - 2/5 = 3/5 οf the year.

Tο find the ratiο οf the time Sam spends wοrking fοr his mοther tο the time he spends wοrking fοr his father per year, we can write:

Sam wοrked fοr his father = 2/3 οf year

Remaining time = 1/3

Sam wοrked fοr his mοther = 1/3(remainder year)=(1/3)*(1/3)

     =1/9

Ratiο οf time spent fοr mοther and father is

= (1/9):(2/3)

=(1/3):2

= 1:6

Sο, οptiοn d) 1/6 is cοrrect answer

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Complete question:

Sam works for his father for 2/3; of the year and works for his mother = of the remainder year. What is the

ratio of the time Sam spends working for his mother to the time he spends working for his father per year?

a) The linear function that gives the sales in x years after 2011 is of: S(x) = 18x + 191.

b) The slope of the graph of S(x) is of 18, meaning that the sales increase by 18 million a year.

c) The online sales were of 227 billion in the year of 2013.

The slope-intercept representation of a linear function is given by the equation presented as follows:

y = mx + b

The coefficients of the function and their meaning are described as follows:

We take 2011 as the reference year, when the sales were of 191 billion, hence the parameter b is given as follows:

b = 191.

In 3 years, the sales increased by 54 billion, hence the slope m is given as follows:

m = 54/3

m = 18.

Hence the function modeling the sales in x years after 2011 is given as follows:

y = 18x + 191.

The sales were of 227 billion x years after 2011, for which y = 227, hence:

227 = 18x + 191

18x = 36

x = 2.

2 + 2011 = 2013.

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The value of x using similar triangles theorem is = 13/3.

Triangles that resemble one another but may not be exactly the same size are said to be comparable triangles.

When two objects have the same shape but different sizes, they can be said to be comparable.

This indicates that comparable shapes superimpose one another when amplified or de-magnified.

The term "Similarity" refers to this characteristic of like shapes.

Now in the given figure,

the proportion of the triangles' side is same.

So, 12/4 = 13/x

x = 13/3

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The number of pushups done by Grace and Kathryn is 7 and 35 respectively

Equations are mathematical statements with two algebraic expressions flanking the equals (=) sign on either side.

It demonstrates the equality of the relationship between the expressions printed on the left and right sides.

Coefficients, variables, operators, constants, terms, expressions, and the equal to sign are some of the components of an equation. The "=" sign and terms on both sides must always be present when writing an equation.

Given data,

Let the equation be represented as A

Now , the value of A is

Let the number of pushups by Grace be x

Let the number of pushups by Kathryn be y

Now, Kathryn did 5 times as many pushups as Grace

[tex]y = 5x[/tex] be equation (1)

And, they did a total of 42 pushups together

[tex]x + y = 42[/tex] be equation (2)

Substituting the value of y in the equation, we get

[tex]x + 5x = 42[/tex]

[tex]6x = 42[/tex]

Divide by 6 on both sides, we get

[tex]x = 7[/tex] pushups

And, [tex]y = 35[/tex] pushups

So, the number of pushups by Grace is 7 and by Kathryn is 35 respectively

The weight of each box of cereal must be between 21 and 23 ounces for the case to pass the quality assurance test. We can write this as the compound inequality: 21 < b < 23.

A quality assurance test is a process that is used to evaluate the quality of a product or service. It involves checking whether the product or service meets certain standards or specifications, and identifying any defects or issues that need to be addressed.

Let's start by finding the weight of a single box of cereal. We know that the weight of the entire case is the weight of 11 boxes plus the weight of the cardboard box, or:

Weight of case = 11b + 33

where b is the weight of a single box of cereal.

To pass the quality assurance test, the weight of the case must be greater than 264 ounces and less than 286 ounces. Therefore, we can write a compound inequality for b as follows:

264 < 11b + 33 < 286

Next, we can simplify this compound inequality by subtracting 33 from each term:

231 < 11b < 253

Finally, we can divide each term by 11 to solve for b:

21 < b < 23

Therefore, the weight of each box of cereal must be between 21 and 23 ounces for the case to pass the quality assurance test. We can write this as the compound inequality:

21 < b < 23 (in ounces)

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Answer: natural number=11

                integer= -4

                irrational= pi, 0.1010010001.....,root 5

                 rational= 0.1212...., -3/5,0.3,2 1/4

Step-by-step explanation:

Between 4 and 4.5

sqrt(20)

Between 4.5 and 5

sqrt(22)

sqrt(23.1)

Between 5 and 5.5

sqrt(30)

sqrt(25.9)

sqrt(27.3)

Between 5.5 and 6

sqrt(31)

sqrt(34.9)

Answer:

The answer is 60

Step-by-step explanation:

2x5x6

rearrange by the commutative property

(2x5)x6

Calculate

10x6

calculate the product or quotient to 60

hence the answer is 60

Hoped this helped:D

Alison has five different hats, six different bracelets, and seven cats. She wants to take a selfie with a hat, a bracelet, and two cats. So she can take 630 different selfies.

         She wants to take selfies with what she has, and the question asks how many different selfies can she take.

    Let's solve the question below:

         The total number of selfies Alison can take is 5 × 6 × ( ₇C₂ )

          As Alison wants to take a selfie with a hat, a bracelet, and two cats, there are 5 hats and 6 bracelets she can select from, and she needs to select 2 cats out of 7 available cats.

          We can use the combination formula to calculate the total number of ways:

            ₇C₂ = [tex](7 * 6)/2[/tex]

                   = 21

  Hence, Alison can take [tex]5 * 6 * 21[/tex] = 630 different selfies with a hat, a bracelet, and two cats.

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b + d ≥ 9 this inequality states that the sum of hours babysitting, b, and hours walking dogs, d, must be greater than or equal to 9 in order for Ryan to meet his weekly work requirement.

What is inequality?

In mathematics, an inequality is a statement that compares two quantities, indicating whether they are equal or not, and in what direction they differ. An inequality is represented by one of the following symbols: < (less than), > (greater than), ≤ (less than or equal to), ≥ (greater than or equal to).

The inequality that represents the possible values for the number of hours babysitting, b, and the number of hours walking dogs, d, that Ryan can work in a given week is:

b + d ≥ 9

This inequality states that the sum of hours babysitting, b, and hours walking dogs, d, must be greater than or equal to 9 in order for Ryan to meet his weekly work requirement.

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The expected number of patients who will report symptomatic relief is 20.9. and the probability of exactly 20 patients reporting relief being 0.1977, and the probability of at least 20 patients reporting relief being 0.3832.

(a) The expected number of patients who will report symptomatic relief is 20.9.

The probability of a patient reporting symptomatic relief is 0.95, so the probability of a patient not reporting relief is 0.05. Using the binomial distribution formula, the expected value of the number of patients who will report relief is:

E(X) = n * p = 22 * 0.95 = 20.9

(b) The probability that exactly 20 patients will report symptomatic relief is 0.1977.

Using the binomial distribution formula, we can calculate the probability of exactly 20 patients reporting relief:

P(X = 20) = (22 choose 20) * 0.95^20 * 0.05^2 = 0.1977

(c) The probability that at least 20 patients will report symptomatic relief is 0.3832.

Using the binomial distribution formula, we can calculate the probability of 20 or more patients reporting relief:

P(X >= 20) = P(X = 20) + P(X = 21) + ... + P(X = 22)

P(X >= 20) = 1 - P(X < 20)

P(X >= 20) = 1 - (P(X = 0) + P(X = 1) + ... + P(X = 19))

P(X >= 20) = 1 - 0.6168

P(X >= 20) = 0.3832

Therefore, the probability that at least 20 patients will report symptomatic relief is 0.3832.

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Answer:

d ≈ 5.4

Step-by-step explanation:

calculate the distance d using the distance formula

d = [tex]\sqrt{(x_{2}-x_{1})^2+(y_{2}-y_{1})^2 }[/tex]

with (x₁, y₁ ) = (2, 2 ) and (x₂, y₂ ) = (4, 7 )

d = [tex]\sqrt{(4-2)^2+(7-2)^2}[/tex]

   = [tex]\sqrt{2^2+5^2}[/tex]

  = [tex]\sqrt{4+25}[/tex]

  = [tex]\sqrt{29}[/tex]

 ≈ 5.4 ( to the nearest tenth )

If the probability that a player makes a free throw is 0.4, the probability that they do not make a free throw is 1 – 0.4 = 0.6.

The probability that a player makes three consecutive free throws is 0.4 × 0.4 × 0.4 = 0.064. If a player attempts three free throws, there are three possible outcomes: make all three, miss one and make two, or miss two and make one.

The probability of making all three is 0.064, the probability of missing one and making two is 0.4 × 0.4 × 0.6 + 0.4 × 0.6 × 0.4 + 0.6 × 0.4 × 0.4 = 0.288, and the probability of missing two and making one is 0.6 × 0.6 × 0.4 + 0.6 × 0.4 × 0.6 + 0.4 × 0.6 × 0.6 = 0.432.

Therefore, the probability of leaving the court in three attempts is 0.064 + 0.288 + 0.432 = 0.784. If a player misses all three attempts, they will have to try three more times, and the probability of leaving the court in six attempts is 0.784 + 0.064 × 0.288 × 0.432 = 0.861.

If a player misses all six attempts, they will have to try three more times, and the probability of leaving the court in nine attempts is 0.861 + 0.064 × 0.288 × 0.432 × 0.064 × 0.288 × 0.432 × 0.064 × 0.288 × 0.432 = 0.926.

If a player misses all nine attempts, they will have to try three more times, and the probability of leaving the court in twelve attempts is 0.926 + 0.064 × 0.288 × 0.432 × 0.064 × 0.288 × 0.432 × 0.064 × 0.288 × 0.432 × 0.064 × 0.288 × 0.432 × 0.064 × 0.288 × 0.432 = 0.974.

Since the probability of leaving the court in twelve attempts is greater than 0.9, the probability of leaving the court in ten or fewer attempts is greater than 0.9. Therefore, the probability that a player can leave the court in 10 or fewer attempts is greater than 0.9.

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Step-by-step explanation:

Blank 1 = 82

Blank 2 = 82

Blank 3 = 98

Therefore, the rate of change over the interval [-1, 2] for Function B is 32/3.

In mathematics, a function is a rule that assigns to each input value (also known as the independent variable) a unique output value (also known as the dependent variable). In other words, a function is a relationship between a set of inputs and a set of possible outputs with the property that each input is related to exactly one output. Functions can be represented in various forms such as algebraic expressions, tables, graphs, or even words. Functions play a crucial role in many areas of mathematics, science, and engineering, as they provide a way to model and describe real-world phenomena and relationships between quantities.

Here,

For Function A, the formula is f(x) = 4x + 1. To find the rate of change over the interval [-1, 2], we need to calculate the slope of the line that passes through the points (-1, f(-1)) and (2, f(2)). The slope of a line passing through two points (x1, y1) and (x2, y2) is given by the formula:

slope = (y2 - y1) / (x2 - x1)

Substituting the values for Function A, we get:

slope = (f(2) - f(-1)) / (2 - (-1))

slope = (4(2) + 1 - (4(-1) + 1)) / (2 - (-1))

slope = (9 + 5) / 3

slope = 14/3

Therefore, the rate of change over the interval [-1, 2] for Function A is 14/3.

For Function B, the formula is g(x) = 10x + 2. To find the rate of change over the interval [-1, 2], we need to calculate the slope of the line that passes through the points (-1, g(-1)) and (2, g(2)). The slope of a line passing through two points (x1, y1) and (x2, y2) is given by the formula:

slope = (y2 - y1) / (x2 - x1)

Substituting the values for Function B, we get:

slope = (g(2) - g(-1)) / (2 - (-1))

slope = (10(2) + 2 - (10(-1) + 2)) / (2 - (-1))

slope = (20 + 12) / 3

slope = 32/3

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Answer:

Step-by-step explanation:

We can start by simplifying the expression using the laws of exponents:

343^(2x) * 49^(-x/2) = 49^(x/2)

We can then simplify further by expressing everything in terms of 7 (since 7 is the common factor of both 343 and 49):

(7^3)^(2x) * (7^2)^(-x/2) = (7^2)^(x/2)

Applying the laws of exponents again, we get:

7^(6x) * 7^(-x) = 7^x

7^(6x - x) = 7^x

7^(5x) = 7^x

Now we can solve for x by equating the exponents on both sides:

5x = x

4x = 0

x = 0

Therefore, the solution to the equation is x = 0.

Answer:

x = 0

Step-by-step explanation:

343^(2x) * 49^(-x/2) = 49^(x/2)

(7^3)^(2x) * (7^2)^(-x/2) = (7^2)^(x/2)

7^(6x) * 7^(-x) = 7^(x)

Now, we can simplify the equation further by combining the like terms on both sides:

7^(6x - x) = 7^(x)

7^(5x) = 7^(x)

We can solve for x by equating the exponents on both sides of the equation:

5x = x

4x = 0

x = 0

Therefore, the solution to the equation is x = 0.

Diana needs 60 grams of coffee beans to make 96 fluid ounces of coffee for her guests.

Determine whether two ratios or fractions are equivalent using the proportion formula. Dividing the provided values will reveal the value that is missing. As an example of the percentage formula: A and d are the extreme terms, while b and c are the mean terms. Hence, b::c: d = a/b = c/d.

We can resolve the issue by using proportions.

The ratio of coffee beans to liquid ounces in Diana's ordinary coffee must first be determined.

48 fluid ounces / 30 grammes

By reducing the numerator and denominator by 6, we may simplify the ratio:

Eight fluid ounces/5 grammes

We can now apply this proportion to determine how many grammes of coffee beans Diana needs to prepare 96 ounces of coffee:

5 grams/8 fluid ounces = 96 fluid ounces x grammes

After cross-multiplying and finding x, we obtain:

x = (96 ounces * 5 grammes) / 8 ounces

x=60 grammes.

In order to prepare 96 fluid ounces of coffee for her visitors, Diana needs 60 grammes of coffee beans.

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Total distance of 7m, which is the shortest distance between point P and point R.

Distance is the physical separation between two objects or points. It is usually measured in units such as meters, kilometers, feet, miles, or light-years. Distance is a key concept in physics, mathematics, engineering, and other scientific disciplines. It plays an important role in our everyday life, such as when we measure the distance between two cities, two buildings, or two places.

To determine the shortest distance between point P and point R, we need to calculate the distances between each point and then find the shortest path.

First, we need to calculate the distances between each point. Starting with the points closest to point R, we can find the distance between point R and point Q to be 4m. The distance between point Q and point P is 3m, from the given information. To find the distance between point R and point U, we need to calculate the distance between point U and point V which is 10m, and then add 8m to account for the 8m between point R and point V. This gives us a distance of 18m. The distance between point R and point S is 8m, and the distance between point S and point T is 8m.

Next, we need to calculate the shortest path between point P and point R. From point P, the shortest route would be to travel 3m south to point Q, then 4m east to point R. This gives us a total distance of 7m, which is the shortest distance between point P and point R.

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Complete questions as follows-
Point U is 8m east of point R. Point P is 3m north of point Q. Point U is 10m north of point V. Point W is 8m west of point V. Point R is exactly between point S and point T. Point R is 4m east of point Q. Point T is in 8m south of point S.
What is the shortest distance between point P and point R?

The water surface in the conical tank is rising at a rate of approximately 0.16 feet per minute when the water depth is 5 feet.

To solve for this, we can use related rates. Since the tank is being filled with water at a constant rate of 2 ft³/min , we know that the rate of change of the volume of water in the tank is constant. We can use the formula for the volume of a cone to relate the volume of water in the tank to the height of the water in the tank:

V = (1/3) * pi * r² * h

Taking the derivative of both sides with respect to time gives:

dV/dt = (1/3) * pi * r² * dh/dt

We know that dV/dt = 2 ft³/min, r = 2 ft, and h = 5 ft. Solving for dh/dt:

dh/dt = (3 / pi * r²) * dV/dt

dh/dt = (3 / 4 * pi) * 2

dh/dt = 0.16 ft/min

Therefore, the water surface is rising at a rate of approximately 0.16 feet per minute when the water depth is 5 feet.

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Therefore , the solution of the given problem of function comes out to be  f(g(4)) = 66.

The midterm examination will have questions on each subject, mathematics, variable design, and both real and imagined locations. a list of the relationships between different elements that collaborate to create the same result. A service is composed of numerous distinctive components that cooperate to create distinctive results for each input. Each postbox also has a distinct address, which may be an enclave.

Here,

a) We must multiply f(x) and g(x) in order to obtain f(x)  g(x):

=>  f(x) · g(x) = (-2x+ 4)

The formula is

=> (-6x - 7) = 12x² + 14x - 24x - 28 = 12x² - 10x - 28.

As a result,

=>  12x² - 10x - 28 is what f(x)  g(x) equals.

b) We must first determine g(4) in order to obtain f(g(4)):

=> g(4) = -6(4) - 7

=>    -31

We can now change g(4) to f(x) as follows:

=> f(g(4)) = f(-31)

=>   -2(-31) + 4

=>  62 + 4

Consequently, f(g(4)) = 66.

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Answer: 5/2


fraction of 2.5 is 5/2

Answer:

2 1/2 or 5/2 as improper fraction

2 is a whole number and you have .5 left over

To convert to fraction .5 is the same as 1/2

So it gives you 2 1/2

By the way thanks for the Brainly points :)

If we change a 95% confidence interval estimate to a 99% confidence interval estimate, we can expect the interval to become wider.

A confidence interval is a range of values that is likely to contain the true population parameter with a certain degree of confidence. A 95% confidence interval means that if we were to repeat the sampling and estimation process many times, we can expect the true population parameter to fall within the interval about 95% of the time.

If we change the confidence level from 95% to 99%, we are increasing the degree of confidence. This means that if we were to repeat the sampling and estimation process many times, we can expect the true population parameter to fall within the interval about 99% of the time.

But, to achieve this higher degree of confidence, we need to widen the interval. This is because as the degree of confidence increases, the interval needs to become wider to capture more possible values of the population parameter.

Therefore, if we change a 95% confidence interval estimate to a 99% confidence interval estimate, we can expect the interval to become wider.

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The dimension of the solution space for 3 linearly independent equations in 5 unknowns is 2.

The dimension of the solution space for 3 linearly independent equations in 5 unknowns is 2. This is because, when solving a system of equations, the number of equations must match the number of unknowns; otherwise, it is impossible to solve. In this case, the number of equations (3) is less than the number of unknowns (5), meaning that the system is underdetermined. This means that there are infinite solutions, and the dimension of the solution space is 2 (the number of free variables).

In other words, the solution space is a two-dimensional plane where each point represents a possible solution to the system of equations. As the equations are linear, the solution space forms a linear subspace, which means that it is a flat surface.

It is also important to note that the linear independence of the equations is crucial to this solution. If the equations are dependent, then the solution space can have a dimension of 1, 0, or even a negative number. So, the dimension of the solution space for 3 linearly independent equations in 5 unknowns is 2.

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Answer:

1.15 dollars

Step-by-step explanation:

To calculate the cost of 1 pound of apples, we can divide the total cost of 4 pounds of apples by 4.

The total cost of 4 pounds of apples is 4.60 dollars.

So, the cost of 1 pound of apples would be 4.60 / 4 = 1.15 dollars.

The cost in dollars of 1 pound apples is $1.15

Division is one of the four basic operations of arithmetic, the ways that numbers are combined to make new numbers.

The process of dividing a number up into equal parts, and finding how many equal parts can be made. It is represented by the symbol "÷" or sometimes "/"

Division is breaking a number up into an equal number of parts.

Given that, a shopper buys 4 pounds of apples for 4.60, we need to find the cost in dollars of 1 pound of apples,

To calculate the cost of 1 pound of apples, we can divide the total cost of 4 pounds of apples by 4.

The total cost of 4 pounds of apples is 4.60 dollars.

So, the cost of 1 pound of apples would be 4.60 / 4 = 1.15 dollars.

Hence, the cost in dollars of 1 pound apples is $1.15

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