please help!! x-4.7y+9.1 + -x+5.8=12.4

The volume of the rock is 9.5 mL.

What is the volume ?

To find the volume of the rock using water displacement, we need to subtract the initial volume of water (20 mL) from the final volume of water with the rock in the cylinder (29.5 mL). The difference between the two volumes represents the volume of the rock.

Volume of rock = Final volume - Initial volume

Volume of rock = 29.5 mL - 20 mL

Volume of rock = 9.5 mL

Therefore, the volume of the rock is 9.5 mL.

Volume is the amount of space occupied by an object or a substance. It is a three-dimensional quantity that can be measured in units such as cubic meters (m³), cubic centimeters (cm³), liters (L), or milliliters (mL), depending on the size of the object or substance being measured.

The formula for calculating the volume of a simple geometric shape, such as a cube or a sphere, can be found by multiplying the length, width, and height of the object. For more complex shapes, the volume can be calculated using methods such as water displacement, which involves measuring the amount of water displaced by an object when it is submerged in a container of water.

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Complete question is: A rock has a mass of 27.54 grams. Since it can't be measured to find its volume, water displacement is used. It is placed in a graduated cylinder with 20 mL of water. Once the rock is in the cylinder, the liquid level is 29.5 mL. the volume of the rock is 9.5 mL.

the call charges for 300 minutes on this contract are R300.

the monthly cost of talking for 300 minutes on this contract is R500.

To determine the call charges for 300 minutes on this contract, we first need to find out how many minutes are above the 50 free minutes.

300 - 50 = 250 minutes above the free minutes.

The call charges for these 250 minutes are:

250 x R1.20 = R300

Therefore, the call charges for 300 minutes on this contract are R300.

To determine the monthly cost of talking for 300 minutes on this contract, we need to add the subscription fee to the call charges:

Monthly cost = Subscription fee + Call charges

Monthly cost = R200 + R300

Monthly cost = R500

Therefore, the monthly cost of talking for 300 minutes on this contract is R500.

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The linear regression equation that gives the quantity of hoodies sold as a function of the price: y = -2.6147x + 215.34

And the number of hoodies the bookstore can sell if the price is $32. = 131

To find the linear regression equation that represents the quantity of hoodies sold as a function of the price, we will use a calculator or a spreadsheet program to perform linear regression analysis on the data.

The scatter plot with the line of linear regression of the data is shown below.

The linear regression equation that gives the quantity of hoodies sold as a function of the price is:

y = -2.6147x + 215.34

here x represents the price of hoodie and y represents the quantity of hoodies.

Now we determine the number of hoodies the bookstore can sell if the price is $32.

i.e., for x = 32 we need to find the value of y

y = -2.6147(32) + 215.34

y = 131.6696

y ≈ 131

Therefore,  the number of hoodies the bookstore can sell if the price is $32. = 131

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Find the complete question below.

-12.75 belongs to the set of Rational numbers.

A rational number is a number that can be expressed as the quotient or fraction frac p q of two integers, a numerator p

and a non-zero denominator q.

Rational numbers are numbers that can be expressed as a fraction of two integers (p/q), where q is not equal to zero.

Identify the number: -12.75

Determine if it can be expressed as a fraction of two integers: -

12.75 can be written as -51/4, which are both integers.

Confirm that the denominator (q) is not equal to zero:

In this case, q = 4, which is not equal to zero.

Therefore, -12.75 belongs to the set of Rational numbers.

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Answer: coin

Step-by-step explanation: because the dice has to many outcomes

from the graph we can clearly see that range along x axis is (-2π,2π) and along y axis is (4,-4)

what is range ?
In statistics, the range is a measure of the spread or dispersion of a set of data. It is the difference between the maximum and minimum values in a dataset.

In the given question,

from the graph we can clearly see that range along x axis. the range is a measure of the spread or dispersion of a set of data. It is the difference between the maximum and minimum values in a dataset.

the start point and end point of wave  is (-2π,2π) and along y axis the start point and end point of wave  is (4,-4)

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Answer & step-by-step explanation:

To rotate a point (x, y) 270° counterclockwise about the origin, we can swap the x and y coordinates and negate the new x coordinate. So the new coordinates for L(1, 6) would be:

x' = -6

y' = 1

Therefore, the new vertex for L would be (-6, 1). Similarly, the new vertices for M(8, 7) and N(5, 2) would be:

M': (-7, 8)

N': (2, 5)

So the rotated triangle would have vertices L'(-6, 1), M'(-7, 8), and N'(2, 5).

Answer:

M': (-7, 8)

N': (2, 5)

Step-by-step explanation:

I did the test

Hope this helps :)

Answer:

36 cm

Step-by-step explanation:

a = 1/2 h(b1+b2)

So 10 + 8 = 18 18x4= 72/2  = 36 cm

The changes in the perimeters and areas are stated below

Part (a)

When each dimension of an isosceles trapezoid is multiplied by a scale factor of 3, the perimeter of the trapezoid is also multiplied by 3.

This is because the perimeter is the sum of the lengths of all the sides, and each side is scaled by a factor of 3.

Similarly, when each dimension is multiplied by a scale factor of 4, the perimeter is multiplied by 4.

Part b

When each dimension of an isosceles trapezoid is multiplied by a scale factor of 3, the area of the trapezoid is multiplied by a factor of 9.

Similarly, when each dimension is multiplied by a scale factor of 4, the area is multiplied by a factor of 16, since each dimension is scaled by a factor of 4, and the area is proportional to the square of the scale factor.

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Answer:

200

Step-by-step explanation:

20x for x=10

you are replacing the x for 10 which would be

20 x 10 = 200

x=1/2

Step-by-step explanation:

To find x, you divide both sides by the coefficient of x which is 20 so when you divide 10 by 20 it gives you 1/2

55

The median basically means the average of the tenth and eleventh numbers as if the 20 numbers were "cut in half" to find the number in the middle. The median is all based on the order of the numbers from least to greatest. If the largest 8 numbers are increased by ten, that basically means that the tenth and eleventh numbers are unaffected and the order still stays the same from least to greatest. The median would still be 55.

Answer:

c 96%

Step-by-step explanation:

the system of inequalities that represents this situation is: x ≤ 50 , y ≤ 100 , 175 - y ≥ x Let's start by defining some variables:

Let x be the number of single reservations.

Let y be the number of reservations for two or more people.

Since there are 50 single rooms and x single reservations, there must be at least 50 - x double rooms available for reservations for two or more people. Since each of these double rooms can accommodate 2 or more people, the total number of people who can be accommodated in these double rooms is 2(50 - x) = 100 - 2x.

The total number of people who can be accommodated in the hotel is 2x + (100 - 2x) = 100. This means that y, the number of reservations for two or more people, must satisfy the inequality y ≤ 100.

Each reservation for two or more people requires a double room, so the total number of double rooms used for reservations for two or more people is y. Since there are 175 double rooms in the hotel, the number of double rooms available for single reservations is 175 - y. Each single reservation requires one room, so the total number of single rooms used for reservations is x.

Therefore, the system of inequalities that represents this situation is:

x ≤ 50

y ≤ 100

175 - y ≥ x

The first inequality represents the fact that the number of single reservations must be less than or equal to the number of single rooms available. The second inequality represents the fact that the number of reservations for two or more people must be less than or equal to the total number of people who can be accommodated in double rooms. The third inequality represents the fact that the number of double rooms available for single reservations must be greater than or equal to the number of single reservations.

These three inequalities together represent the constraints on the number of single and double rooms that can be used for reservations, and the number of people who can be accommodated in the hotel. Solving this system of inequalities will give us the feasible region of the problem, which will allow us to find the optimal solution

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the cut-off dollar amount for being in the top 3% of patients is approximately $487.32.

To find the cut-off dollar amount for being in the top 3% of patients visiting the emergency room for a sore throat, we need to use the normal distribution with a mean of $320 and a standard deviation of $89.
Find the z-score for the top 3%
To find the z-score, we can use a z-table, which provides the area under the curve of the standard normal distribution. Since we want to find the top 3%, we will look for 0.97 (1 - 0.03) in the z-table. The z-score corresponding to 0.97 is approximately 1.88.
Convert the z-score to a dollar amount
Now that we have the z-score, we need to convert it to a dollar amount using the mean and standard deviation. The formula for this is:
X = μ + (z * σ)
Where X is the dollar amount, μ is the mean ($320), z is the z-score (1.88), and σ is the standard deviation ($89).
Calculate the cut-off dollar amount
Using the formula from Step 2, we can now calculate the cut-off dollar amount:
X = 320 + (1.88 * 89)
X = 320 + 167.32
X ≈ 487.32

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20 trials may not be enough to get a reliable estimate of the probability, especially if the true probability is close to 0.5.

Based on Zoe's results,

The probability that she will make it to the finals of the Royal Arena Chess Tournament is 96.2%.  

Here's how to solve the problem:  

Zoe must win at least 5 matches out of 8 to make it to the finals.  

There are different ways to solve the problem, but one way is to use the binomial probability formula:  

P(X = k) = (n choose k) * [tex]P^{k}[/tex] * [tex]q^{n-k}[/tex]

where:

P(X = k) is the probability of getting exactly k successes out of n trialsn is the number of trialsp is the probability of success in one trialq is the probability of failure in one trial is the probability of getting k successes q^(n-k) is the probability of getting n-k failures(n choose k) is the binomial coefficient, which represents the number of ways to choose k objects out of n distinct objects without regard to order (n choose k) = n! / (k! * (n-k)!)

The binomial probability formula is used to calculate the probability of getting a specific number of successes in a fixed number of independent trials, each with the same probability of success.

It is a discrete probability distribution that describes the probability of X successes in n trials.For this problem:P(X >= 5) = P(X = 5) + P(X = 6) + P(X = 7) + P(X = 8)where:P(X >= 5) is the probability of getting at least 5 successes out of 8 trialsP(X = 5) is the probability of getting exactly 5 successes out of 8 trialsP(X = 6) is the probability of getting exactly 6 successes out of 8 trialsP(X = 7) is the probability of getting exactly 7 successes out of 8 trialsP(X = 8) is the probability of getting exactly 8 successes out of 8 trials

T[tex]0.5^{5}[/tex]he probabilities can be calculated using the binomial probability formula with n = 8 and p = 0.5  

Since Zoe estimates she has a 50% chance of winning each match

P(X = 5) = (8 choose 5) * [tex](0.5)^5[/tex]* [tex](0.5)^{(8-5)[/tex] = 56 * 0.03125 * [tex]0.5^3[/tex]

= 0.21875P(X = 6)

= (8 choose 6) * [tex](0.5)^6[/tex] * [tex](0.5)^{(8-6)[/tex]

= 28 * 0.015625 * [tex]0.5^2[/tex]

= 0.109375P(X = 7)

= (8 choose 7) * [tex](0.5)^7[/tex] * [tex](0.5)^{(8-7)[/tex]

= 8 * 0.0078125 *[tex]0.5^1[/tex]

= 0.03125P(X = 8)

= (8 choose 8) * [tex](0.5)^8[/tex] * [tex](0.5)^{(8-8)[/tex]

= 1 * 0.00390625 * [tex]0.5^0[/tex]

= 0.00390625P(X >= 5)

= 0.21875 + 0.109375 + 0.03125 + 0.00390625

= 0.36328125

Therefore, the probability that Zoe will make it to the finals of the Royal Arena Chess Tournament is approximately 36.3%.

However, Zoe simulates the situation by rolling a six-sided die 8 times.  

The simulation gives an estimate of the probability, which may be different from the exact probability calculated using the binomial probability formula.  

The simulation results may also depend on the sample size (i.e., the number of trials).  

In this case, 200 trials may not be enough to get a reliable estimate of the probability, especially if the true probability is close to 0.5.  

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Based on Zoe's 200 trials in the simulation the probability that she will make it to the finals means 22% chance.

The probability of her making it to the finals can be calculated by looking at the number of trials where she won at least 5 matches.

According to the table, she won 5, 6, 7, or 8 matches in 14, 21, 8, and 1 trials, respectively.
To find the probability,
1. Add up the number of trials where Zoe won at least 5 matches: 14 + 21 + 8 + 1 = 44 trials
2. Divide this sum by the total number of trials (200): 44/200

In the simulation,

Each even number represents a win for Zoe.

Therefore, we can calculate the probability of Zoe winning at least 5 matches by adding up the probabilities of getting 5, 6, 7, or 8 even numbers in 8 rolls of a six-sided die.

Using the table provided, we can see that there are 218 trials out of 200 where Zoe gets 5 or more even numbers. Therefore, the probability of Zoe winning at least 5 matches is:

218/200 = 1.09 or 109%

This means that based on the simulation, Zoe is more likely than not to make it to the finals.

However,

It is important to note that the simulation assumes that each match has a 50% chance of being won by Zoe, which may not be accurate in real life.

The actual probability of Zoe making it to the finals may be different from the simulation results.
So, based on Zoe's results, the probability that she will make it to the finals is 44/200 or 0.22, which means a 22% chance.

This is based on her simulation using a six-sided die, not her actual 50% chance of winning each match.

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Answer: B. y = -x + 5

Step-by-step explanation:

Given the table, lets pick two consecutive points to find the slope.

(-4, 9) (-1, 6) are the first points that show in the table.

Lets plug it in the (y2-y1)/(x2-x1) expression

(6 - 9)/(-1 - -4)

=(-3)/(3)

=-1

The slope is -1

Now lets look at the answer choices and see if any of the equations with the format y= mx + b has -1 as its slope. We can eliminated a and c.

Now lets use the data in the table, and plug in a given point to see if which of the equations left are correct.

Lets use the point: (-4, 9)

For b.

y = -x + 5

9 = -(-4) + 5

9 = 4 + 5

9 = 9

B is the correct answer.

For d.

9 = -(-4) - 5

9 = 4 - 5

9 = -1

this equation is incorrect, so D is incorrect.

Let the first number be x and the second number be y. Then we have:

xy/4 = 10 + 9 + 10

Simplifying the right side:

xy/4 = 29

Multiplying both sides by 4:

xy = 116

Now we need to find two numbers whose product is 116. We can start by listing the factors of 116:

1, 2, 4, 29, 58, 116

Since we are looking for two numbers whose product is 116, we can try pairs of factors until we find a pair that works:

1 x 116 = 116 (not a sum of two numbers)

2 x 58 = 116 (sum is 60, not 19)

4 x 29 = 116 (sum is 33, not 19)

So the only pair that works is:

x = 29 and y = 4

Let's check if these values satisfy the original equation:

xy/4 = 29 x 4 / 4 = 29 = 10 + 9 + 10

So the solution is x = 29 and y = 4.

The above given graph doesn't follow the property of onto-function so, it is not a onto in nature.

What about onto-function?

In mathematics, an onto function (or surjective function) is a function from one set to another in which every element in the target set is mapped to by at least one element in the domain set. In other words, an onto function maps every element in the target set to some element in the domain set.

Formally, let f: A → B be a function from set A to set B. The function f is onto if and only if for every element b in the target set B, there exists an element a in the domain set A such that f(a) = b.

An onto function is sometimes described as a function that "hits" every element in the target set. This means that the function's range is equal to its target set, or in other words, every element in the target set has a corresponding element in the range.

The concept of onto functions is important in many areas of mathematics, including analysis, algebra, and topology. It is used to study the properties of functions and to define various types of spaces and structures.

According to the given information:

x represents the input, y represent the output

According to the graph, there exists more than one x - values for at least one y - values.

So, there exists more than one input for at least one output

Hence-:  No, there exists more than one input for at least one output is correct option.

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The amount of tickets earned by friends playing an arcade game  is 1 ticket .

what is meaning of term   amount ?

The term "amount" generally refers to a quantity or a sum of something, often related to a numerical value. It can refer to the total value or quantity of something, such as the amount of money in a bank account

what is arcade game?

An arcade game is a type of video game that was originally designed to be played in public places, such as arcades, malls, and restaurants. These games has  gameplay mechanics

In the given question,

To regroup the amounts so that each person has the same amount, we need to find the total number of tickets earned and divide by the number of friends.

Total number of tickets earned = 0 + 0 + 0 + 1 + 1 + 2 + 3 = 7

Number of friends = 7

Each person will have the same amount of tickets if we divide the total number of tickets earned by the number of friends:

7 tickets ÷ 7 friends = 1 ticket per person

Therefore, each person should receive 1 ticket.

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Answer:

18

Step-by-step explanation:

Remember, When finding the area of a triangle (especially a right angled one) the equation is 1/2bh or 0.5bh

Meaning we can do 6x6x0.5 = 18

Arc BEC measures 210°.

Hence, option (d) 210° is the correct answer.

The measure of arc BEC in circle D is 210°.

Given,

The figure is as follows.

The measure of arc BEC in circle D is to be found.

We see that the arc BEC is subtended by the angle BAC.

We can find the measure of this angle by using the fact that it is the average of the two arcs that it subtends (i.e. arcs BC and DE).

∠BAC = 1/2 (arc BC + arc DE)

= 1/2 (74° + 346°)

= 210°

option (d) 210° is the correct answer.

Now, the measure of arc BEC is equal to the measure of the angle BAC.

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Answer:

The shape formed is rectangle.

When we solve for train speed we get: -190 mph

It is clear that this is impossible because speed cannot be negative. Thus, the problem statement must contain a mistake.

The rate at which an object travels a distance is called speed.

This is a well-known algebraic puzzle. Let's use "x" for the other train's speed. The first train travels 1012 miles in 4 hours, or 253 miles multiplied by 4.

The second train travels 4 hours' worth of distance, or x * 4 miles. They will have travelled a total of 252 miles when they cross paths. Thus, we can create the following equation:

1012 + 4x = 252

When we solve for x, we get:

x = (252 - 1012) / 4 = -190 mph

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Answer:24 seconds

Step-by-step explanation:

Since A(t) equals the total number of pixels in the image, then to figure out when it will be zero you just need to set A(t) equal to zero. This gives you the equation

[tex]0=(256-8t)(192-8t)[/tex]

Since this equation equals zero, we know either 256-8t must equal 0 or 192-8t must since they are multiplied.

We can split this into two equations

[tex]256-8t=0[/tex]

[tex]8t=256\\t=32[/tex]

and

[tex]192-8t=0\\8t=192\\t=24[/tex]

So, after 24 and 32 seconds both the width and height equal zero. Only the height or the width need to equal zero for the total area to equal zero (A=w*h), so we go with the lesser time, 24 seconds.

Answer:

The probability of the first marble being blue is 4/9 and the probability of the second marble being green is 2/8 (8 because the first marble you pulled out didn't get put back, therefore you only have 8 marbles to choose from now) and 2/8 in simplest form is 1/4.

"The beautiful thing about learning is that no one can take it away from you." :)

The inverse function of f(x) is [tex]f^{(-1)(x)} = x/20.4[/tex], which represents a linear function with a slope of 1/20.4 and a y-intercept of 0.

In computer science and mathematics, a graph is a collection of vertices or nodes, along with a set of edges that connect them. Graphs are commonly used to model relationships between objects or entities.

In mathematics, a function is a rule that maps one set of values (the domain) to another set of values (the range), such that each element in the domain corresponds to exactly one element in the range.

According to given information:

The function f(x) = 4 * 5.1 is a constant function with a value of 20.4. The graph of f is a horizontal line passing through the point (0, 20.4) with no intercepts on the x or y axis.

The inverse function of f(x) is [tex]f^{(-1)(x)} = x/20.4[/tex], which represents a linear function with a slope of 1/20.4 and a y-intercept of 0.

To sketch the graph of [tex]f^{(-1)(x)}[/tex], plot the point (0,0) on the coordinate plane, which represents the y-intercept. Then plot another point by choosing any x-value and finding the corresponding y-value using the formula [tex]f^{(-1)(x)}[/tex] = x/20.4.

To summarize:

The graph of f(x) is a horizontal line passing through the point (0, 20.4) with no intercepts on the x or y axis.

The graph of [tex]f^{(-1)(x)[/tex] is a line passing through the origin with a slope of 1/20.4 and intercepting the x-axis at x = 20.4.

One point on the graph of f(x) is (0, 20.4).

One point on the graph of [tex]f^{(-1)(x)[/tex] is (0, 0), and another point can be found by choosing any x-value and using the formula [tex]f^{(-1)(x)[/tex] = x/20.4 to find the corresponding y-value.

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Answer:

The population standard deviation is a measure of how much variation there is among individual data points in a population. It's a way of quantifying how spread out the data is from its mean.