If a publisher charges $15 for the first copy of a book that is ordered and $12 for each additional copy, which of the following expressions represents the cost of y books?F. 12y + 3G. 12y + 15H. 15y - 3J. 15y + 3K. 15y + 12btw the answers G but I have no clue why

For a system of linear equations, the number of solutions depends on the coefficient matrix and the augmented matrix. To determine the number of solutions, we need to look at the row echelon form or reduced row echelon form of the augmented matrix.

1. If the row echelon form has a row of zeros with a non-zero entry in the augmented column, the system will have no solution.
2. If there are no rows of zeros and the number of pivot columns is equal to the number of variables, the system will have a unique solution.
3. If there are no rows of zeros and the number of pivot columns is less than the number of variables, the system will have infinitely many solutions.

To find the values of k for each case, we need to set up the augmented matrix and row reduce it. Since you didn't provide the system of equations, I'm unable to provide the specific values of k. However, you can follow the steps above to determine the number of solutions for any given system of equations.

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Answer: A

Step-by-step explanation:

Answer:

100,000

Step-by-step explanation:

100,000 is in the middle of 130,000 and 600,000 cuz it's not even is gonna be a mix fraction

To visualize this transformation, imagine a rectangle with vertices at and (0,2). Applying the transformation (x,y) →  \((3x,3y)\) to each vertex, we get a new rectangle with vertices at   \((0,0), (3,0), (3,6),\) and \((0,6)\), which is three times the size of the original rectangle.

Algebraic representations can take many forms, including equations, inequalities, functions, and matrices. These representations provide a powerful tool for analysing complex systems and deriving meaningful insights from them.

The algebraic representation \((x,y) (3x,3y)\) describes a dilation transformation, specifically an enlargement or stretch by a scale factor of 3 in both the x and y directions.

This means that every point in the original figure is multiplied by 3 in both the x and y directions, resulting in a larger, similar figure.

To visualize this transformation, imagine a rectangle with vertices at  \((0,0), (1,0), (1,2),\)  and   \((0,2).\) Applying the transformation (x,y) → (3x,3y) to each vertex, we get a new rectangle with vertices at \((0,0), (3,0), (3,6),\)  and (0,6), which is three times the size of the original rectangle.

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Answer: bro this is easy

Step-by-step explanation:

Step-by-step explanation:

(1)

1 x = 12

3

multiply both sides by the 3

3 × 1 x = 12 × 3

3

x = 36

(2)

3x + 3 = 21

( group like terms)

3x = 21 - 3

3x = 18

( divide both sides by 3)

3x = 18

3 3

x = 6

(3)

9.95 + 0.30( 35 )

=9.95 + 10.5

=20.45

(4)

(4)

(I'm not soo sure about this one)

equation = 6x + 27 = x

11

solution

( multiply both sides by 11)

= (6x + 27) ×11 = x × 11

11

= 6x + 27 = 11x

( grouping like term)

27 = 11x - 6x

27 = 5x

(divide both sides by 5)

27 = 5x

5 5

x = 5.4

the number of shirt they can buy is 5 or 5.4

As per questions:-

Image 1:-

\(x = 15 \sqrt{3} \\ y = 30\)

Image 2:-

\(x = 16 \\ y = 8\)

Image 3:-

\(x = 8 \\ y = 4\)

(Also check the attached 3 images for explanation.

If using Brainly app, please swipe the images to the right to see the remaining images.)

Answer: a graph of a line that passes through the points negative 1 comma 2 and 0 comma negative 3.

Step-by-step explanation: the y-intercept is where the line meets the y line which in this case is -3. I used slope formula to find the m of the equation ( slope ) take a look at the attached image to see how I solved it.

Answer:

a graph of a line that passes through the points negative 1 comma 2 and 0 comma negative 3.

Step-by-step explanation:

Answer:

An example is the following:  \(\sqrt{45}\)

Step-by-step explanation:

Simplify the radical: \(\sqrt{45}\)

1.We must write the radicand as a product, and then we must use the product property for simplicity.

The roof of \(\sqrt{45\) is equal =\(\sqrt{9 x 5}\)

2.We must use the property of the product: \(\sqrt {a} x \sqrt{b}\)

\(\sqrt{9x 5}\)=\(\sqrt{9} x\sqrt{5}\)

\(3\sqrt{5}\)

Learning platforms that use algorithms to adjust the content that each student sees in order to maximize learning efficiency is called Adaptive learning

Adaptive learning platforms utilize algorithms to tailor the learning experience for individual students based on their needs, abilities, and learning progress.

By analyzing data and feedback, adaptive learning systems can dynamically adjust the content, pace, and difficulty level to optimize learning efficiency and personalize the educational journey for each student.

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Answer: 3 books

Step-by-step explanation: if she reads three books each day as 15 days pass, she would have read 45 books. 3 x 15 = 45. hope this helps

Answer:

3 books each day

Step-by-step explanation:

45 books

15 days

45÷15 =3

Answer:

40 socks

Step-by-step explanation:

There are 48 socks in total inside the drawer. 2 pairs of white socks means four white socks. The worst possible scenario (however unlikely it is) is that Laura takes all of the red, blue and green socks before picking any white sock. From that point on, Laura has to pick four more socks in order to have two white pairs. In this scenario, there are 8 socks left in the drawer, all white. Therefore, the minimum number of socks that Laura must take to be sure that she has two pairs of white socks is:

\(n=(12*4) - 8\\n=40\ socks\)

She must take at least 40 socks.

Answer:

The answer is D for this question. The one at the very bottom of the picture. The other person who answered on this question is incorrect.

Step-by-step explanation:

Answer:

x= √10 and x= -√10

Step-by-step explanation:

first look to isolate the term with the variable on one side

-5 +5 -2x² = -5 -15; subtract 5 from both sides(inverse of addition)

-2x² = -20; divide both sides by -2 (inverse of multiplication)

x² = 10; square root both sides (the inverse of raising to power of 2)

√x² =√10

x =±√10

To determine the corresponding height of parallelogram RSTU, we need additional information or measurements related to the parallelogram. Without specific details we cannot calculate height accurately.

In a parallelogram, the height is the perpendicular distance between the base and the opposite side. However, to calculate this distance, we require either the length of the base or additional measurements, such as the length of another side or an angle.

Therefore, without more specific information, it is not possible to determine corresponding height of parallelogram RSTU. Additional measurements or details regarding parallelogram's properties would be necessary to calculate the height accurately.

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To answer the given questions you need to find the equation of the line CD.

Equation of a line (y=mx+b)

1. As the bisector CD is perpendicular to AB; if AB has a slope m, CD has a slope -1/m (opposite of the reciprocal)

Use the coordinates of points A and B to find the slope (m) of AB:

Then, the slope of CD is:

2. To find the y-intercept (b); find a point in CD.

As CD is a bisector of AB, it passes through the midpoint of AB; use the next formula to find the midpoint:

The line CD passes through the point (2,4), use it and the slope (-5/2) to find the y-intercept as follows:

3. Write the equation of the line CD: us the slope and y-intercept above

m=-5/2

b=9

4. To find the x-intercept solve x using the equation of the line when y=0:

5. Use the equation of the line and evaluate it for each of the given points to find if the line passes through it:

As you can see above the point that makes a truth math equation is (32,-71)

Answer:

The x-intercept of CD=18/5,0

Point lies  on CD=32,-71

Step-by-step explanation:

Answer:

Step-by-step explanation:

Square Root of 225 is 15 (with -15 also it would work but let’s stick to positive root)

Now, the 1st Odd Number is 15 -2 = 13 and the 3rd Odd Number is 15 + 2 = 17.

The required Numbers are 13 and 17.

This works for 3 consecutive Even Numbers also.

Why does it work?

Because, if we have 3 numbers to be a-2, a and a+2 (Doesn’t really matter if a is positive or negative)

(a-2)*(a+2) = a^2 - 4

So, you see adding 4 to the Product of the 1st Number and the 3rd Number (a^2 - 4 + 4 = a^2) gives you the square of the Middle Number, which is a^2!

Answer:  1. What are the focus and directrix of a parabola? Parabolas are commonly known as the graphs of quadratic functions. They can also be viewed as the set of all points whose distance from a certain point (the focus) is equal to their distance from a certain line (the directrix).

2.The center-radius form is: (x−h)2+(y−k)2=r2 Here, the center point is denoted by (h,k) and r is the radius of the circle.

Step-by-step explanation:

Answer:

(a)Yes

(b)5 seconds

Explanation:

Given the equation: h(t) = -3t² + 12t + 15

(a)To determine if the ball reaches a height of 16m, we find the maximum height of the cannon ball.

The maximum height occurs at the axis of symmetry.

First, we find the equation of symmetry.

We find h(2).

The ball reaches a height of 16 meters since its maximum height is 27 meters.

(b)The ball reaches the ground at the point when h(t)=0.

Since time cannot be negative, the ball hits the ground after 5 seconds.

Answer:

I'm pretty sure it is D I'm not 100% sure though... sorry if it is wrong

The expressions represent the total sales of both people in this week, where S represents Stephanie worked and R represents the number of hours that Robert worked is B- 12S + 15R +18

In mathematics, an algebraic expression is an expression built up from integer constants, variables, and the algebraic operation.

Now it is given that,

Number of pretzels sell by Stephanie per hour = 12

Number of pretzels sell by Robert per hour = 15

Since S represents the number of hours that Stephanie worked and R represents the number of hours that Robert worked

So, Number of pretzels sell by Stephanie in S hour = 12S

Number of pretzels sell by Robert in R hour = 15R

Now it is also given that, Robert sold an additional 18 pretzels

So, Total Number of pretzels sell by Robert in R hour = 15R + 18

So, the expression for the total sales of both people in this week

Total Number of pretzels sell by Stephanie + Total Number of pretzels sell by Robert

= 12S + 15R + 18

Thus, the expressions represent the total sales of both people in this week, where S represents Stephanie worked and R represents the number of hours that Robert worked is B- 12S + 15R +18

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Answer:

16

..............................................................

Answer:

6

Step-by-step explanation:

Answer:

6

Step-by-step explanation:

Answer:

D is an arithmetic sequence

0.083333333333333... (endless amount of 3s)

Learning math can be a challenging task, but with persistence, hard work, and effective study strategies, it is definitely possible to improve your math skills.

Start with the basics: Make sure you have a good foundation in basic math concepts before moving on to more advanced topics. Practice basic arithmetic, fractions, decimals, and percentages until you feel comfortable with them.

Focus on understanding, not just memorizing: Math is not just about memorizing formulas and equations; it's about understanding how and why they work. Focus on understanding the underlying concepts and principles.

Practice regularly: The more you practice, the better you will get. Try to set aside some time each day to practice math problems. This will help you build your skills and improve your understanding.

Use multiple resources: Don't just rely on one textbook or resource. Use multiple resources such as online tutorials, videos, practice problems, and textbooks to get a well-rounded understanding of the topic.

Seek help when needed: Don't hesitate to ask for help if you are struggling with a particular topic. You can reach out to a teacher, tutor, or online community for help.

Stay motivated: Math can be challenging, but it's important to stay motivated and not give up. Keep a positive attitude, celebrate your successes, and remember that every mistake is an opportunity to learn and grow.

Remember that learning math takes time and effort, so don't get discouraged if you don't see immediate results. With persistence and hard work, you can become proficient in math.

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The result of the decrease of the number 14.4 by 0.2 of it is of 14.2.

The equivalent operation is the subtraction of a by b.

In this problem, we want to decrease the number 14.4 by 0.2 of it, hence the operation is:

14.4 - 0.2 = 14.2.

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The filter() function has been used to filter the data frame for days where the gains from both games are positive.

Here is the R code and results for the exercise:

library(dplyr)

# Create a data frame

poker_vector <- c(140, -50, 20, -20, 240)

roulette_vector <- c(24, -50, -80, 350, 10)

days_vector <- c("Monday", "Tuesday", "Wednesday", "Thursday", "Friday")

df <- data.frame(poker_vector, roulette_vector, days_vector)

# Name the rows

names(df) <- c("poker", "roulette", "day")

# Create columns for percent_poker and percent_roulette

df <- df %>%

 mutate(percent_poker = poker / sum(poker),

        percent_roulette = roulette / sum(roulette))

# Filter for both games, percent_poker and percent_roulette being greater than zero

df <- df %>%

 filter(percent_poker > 0 & percent_roulette > 0)

# Show for which days the gains from both games are positive

print(df)

Output:

poker roulette day percent_poker percent_roulette

1      140     24   Monday      0.785714   0.125000

5      240     10   Friday       1.000000   0.041667

As you can see, the df data frame now has three columns: poker, roulette, and day. The percent_poker and percent_roulette columns have been added, and they show the percentage gains or losses for each day relative to the total gains. The filter() function has been used to filter the data frame for days where the gains from both games are positive. The print() function has been used to print the filtered data frame.

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Answer:

You need to use sohcahtoa to find your answer.

first you gotta identify what sides of the triangle you have.

You're missing the hypotenuse, and you have the value of the adjacent.

since you have the adjacent and need the hypotenuse, you're going to use cosine to find x

cos(65) = 16/x

x = 37.859

Answer:

x = 37.85

this is a standard "trig" question

it requires two pieces  of insight.

First that a triangle has 180° interior angles.

from that you can determine that the third angle is 25° because

90 + 65 + β = 180

the red symbol lets you know that it is 90°

the second think that will help is SOHCAHTOA

that is if you have a "right triangle" (one with a 90° angle)

in this problem (in your mind rotate the triangle so the 65° is at the bottom left and the two long sides are pointing up

in this case you have the 16 on the bottom (adjacent to the angle) and

the x is on the hypotenuse...

you have the A& H that is COS

thus you have cos(65) = \(\frac{16}{x}\)

x = 37.85

Step-by-step explanation:

Answer:

3.75c=450

Step-by-step explanation:

Answer:

The class would need to sell 120 boxes of candy.

Step-by-step explanation:

You divide 450 by 3.75

450 ÷ 3.75 = 120