Lucy bought a doormat for $7 and some placemats for $2 each. Her total average cost per item was $3. Create a rational equation, and determine how many placemats she bought.

Answers

Answer 1

Answer:

Lucy bought 4 placemats.

Step-by-step explanation:

Let n be the number of placemats Lucy bought.

1 doormat = $7

1 placemat = $2

n placemats = $2n

Total = $(7+2n)

Total number of objects bought = n+1

Average [tex]=\dfrac{\$(7+2n)}{n+1}[/tex]

So,

[tex]\dfrac{\$(7+2n)}{n+1}=\$3[/tex]

Solve this equation:

[tex]7+2n=3(n+1)\\ \\7+2n=3n+3\\ \\3n-2n=7-3\\ \\n=4[/tex]

Hence, Lucy bought 4 placemats.

Answer 2

Answer:

4

Step-by-step explanation:

is the answer


Related Questions

Research scientists need a certain type of bacteria to conduct an experiment. There are 2,500 bacteria in a certain culture. The culture grows at a rate of 25% daily. The scientists needs at least 10,000 bacteria to conduct an experiment. What is the least number of days they need to wait for the bacteria culture to reach a quantity of 10,000? (Hint: use a guess-and-check method to determine the lowest number of days that satisfy the requirement.)

Answers

Answer:

  7 days

Step-by-step explanation:

At 25% per day, it will take approximately 3 days to double the population, so approximately 6 days for the population to quadruple. Checking that number, we find it is not quite enough for the experiment, so another day is required.

"Guess and check" as a method of solution works especially well if you have an automated checker to evaluate your guess. A graphing calculator or spreadsheet can work well for this.

_____

We guess 3 days as the doubling time using the "rule of 72" that says the product of percentage and doubling time is about 72. That is, 72/25 ≈ 3. (This is only a very rough approximation of doubling time, best for rates near 8%.)

You watch a roulette wheel spin 8 consecutive times and the ball lands on a red slot each time. what is the probability that the ball will land on a red slot on the next spin?

Answers

Answer:

0.5

Step-by-step explanation:

A roulette wheel is half red and half black.  Each spin is independent: past spins don't change the probability of future spins.  So even if you got 8 reds in a row, the probability of the next spin being red is still 50/50.

Find four solutions of the given function. Write the solutions as ordered pairs.



4x – y = 4

Answers

Final answer:

The four solutions to the function 4x - y = 4 are determined by selecting different x values and calculating the corresponding y values, resulting in the ordered pairs (0, -4), (1, 0), (2, 4), and (3, 8).

Explanation:

To find four solutions to the function 4x – y = 4, we need to choose four different values for x and compute the corresponding y values.

For example, let's choose x = 0, x = 1, x = 2, and x = 3. Substituting these values into the equation:

For x = 0: 4 * 0 - y = 4, so y = -4 For x = 1: 4 * 1 - y = 4, so y = 0 For x = 2: 4 * 2 - y = 4, so y = 4 For x = 3: 4 * 3 - y = 4, so y = 8

So the four solutions (order pairs) are (0, -4), (1, 0), (2, 4), and (3, 8).

Learn more about Finding solutions here:

https://brainly.com/question/33750042

#SPJ2

To find solutions for the given equation 4x - y = 4, pick x values and plug them into the equation to solve for y, resulting in ordered pairs like (0, -4) and (1, 0).

Given equation: 4x - y = 4

Choose x values and plug them into the equation to solve for y.

Write the solutions as ordered pairs (x, y).

Four solutions are (0, -4), (1, 0), (2, 4), and (3, 8).

what is 12.25 as a fraction

Answers

Answer:

[tex]\large\boxed{12.25=\dfrac{49}{4}}[/tex]

Step-by-step explanation:

[tex]12.\underbrace{25}_{2}=\dfrac{1225}{1\underbrace{00}_2}=\dfrac{1225:25}{100:25}=\dfrac{49}{4}\\\\12.25=12+0.25=12+\dfrac{25}{100}=12+\dfrac{25:25}{100:25}=12+\dfrac{1}{4}\\\\=\dfrac{12\cdot4}{4}+\dfrac{1}{4}=\dfrac{48+1}{4}=\dfrac{49}{4}[/tex]

. Solve the following system of equations: 1. y - 3x + 15 = 10

2. 6 - 4x = y

Answers

The first equation can be further simplified so first do that by subtracting 15 to both sides

y - 3x + (15 - 15) = 10 - 15

y - 3x = -5

We know from the second equation that y is 6 - 4x so in the equation y - 3x = -5 plug in 6 - 4x for y

(6 - 4x) - 3x = -5

6 - 4x - 3x = -5

Combine like terms

6 - 7x = -5

(6 - 6) - 7x = -5 - 6

-7x = -11

Isolate x

-7x/-7 = -11/-7

x = 11/7

To solve for y plug in 11/7 in for x in the equation 6 - 4x = y

6 - 4(11/7) =y

6 - 44/7 = y

y = -2/7

so...

(11/7 , -2/7)

Hope this helped!

~Just a girl in love with Shawn Mendes

1.) Solving for X problem 1#

y-3x+15=10

-3x+15-15=10-15-y

-3x=-y-5

-3x/-3=-y-5/3

x=(-y-5)/3

2.) Solving for Y problem 1#

y-3x+15=10

y-3x+3x+15-15=10-15+3x

y=3x-5

1.) Solving for X problem 2#

6-4x=y

-4x+6-6=y-6

-4x/4=y-6/4

x=(y-6)/4

2.) Solving for Y problem 2#

6-4x=y

y=-4x+6

By what factor does the area change if one diagonal is doubled? Explain.

Answers

The area of deltoid is defined by formula:

[tex]A=\dfrac{e\cdot f}{2}[/tex]

Where e and f are diagonals.

If you were to double the size of either one. Let's say f. You would result with:

[tex]A=\dfrac{e\cdot2f}{2}=e\cdot f[/tex]

Which means if either of diagonals double in length the area of deltoid will be twice as big as it was before.

Hope this helps.

r3t40

the kite, which looks more like a rhombus but being called a kite, will look like the one in the picture below.

now, as you see in the picture, the kite is really 4 congruent triangles, each with a base of 2.5 and a height of 5, so their area is

[tex]\bf \stackrel{\textit{area of one triangle}}{\cfrac{1}{2}(2.5)(5)}\implies 6.25\qquad \qquad \stackrel{\textit{area of all four triangles}}{4\left[ \cfrac{1}{2}(2.5)(5) \right]}\implies 25 \\\\[-0.35em] ~\dotfill\\\\ \stackrel{\textit{doubling the base or height}}{4\left[ \cfrac{1}{2}(2.5)(5)\underline{(2)} \right]}\implies \stackrel{\textit{the area is twice as much as the original}}{\underline{(2)}~~\left[ 4\left[ \cfrac{1}{2}(2.5)(5) \right] \right]}[/tex]

Did I do the first question right? can anyone please help me with the 2nd question? Would really appreciate the Help​

Answers

Answer:

  8.  1483.33

  9.  21 months

Step-by-step explanation:

8. Morgan's income after taxes is 55000/12 = 4583.33 per month. The amount  available after expenses is 4583.33 -3100.00 = 1483.33 per month.

Morgan is able to put $1483.33 per month into savings.

__

9. If Morgan is able to save $1483.33 per month, it will take her ...

  $30,000/$1483.33 ≈ 20.2

months to save $30,000. After 20 months, she won't have quite enough, so it will take her one more month to save the desired amount.

It will take Morgan about 21 months to save $30,000.

_

If you like, you can write an equation for "m", the number of months it will take Morgan to save 30,000:

  1483.33×m = 30,000

  m = 30,000/1483.33 ≈ 20.2 . . . . . . divide by the coefficient of m

Help! the file is attached

Answers

Answer:

924/5 ft/s369.6 ft

Step-by-step explanation:

126 mi/h = (126 mi)/(1 h)·(5280 ft)/(1 mi)·(1 h)/(3600 s) = (126·5280/3600) ft/s

126 mi/h = 184.8 ft/s = 924/5 ft/s

__

In 2 seconds, the parachutist falls ...

  (184.8 ft/s)·(2 s) = 369.6 ft

Hamad made a cuboid of size 2cm X 3cm X 4cm. How many such cuboids will be required to make a cube?

Answers

Answer:

576 cuboids

Step-by-step explanation:

Let

x -----> the length side of the cube

n -----> number of cuboids that are needed

we know that

The volume of the cuboid is equal to

[tex]V=(2)(3)(4)=24\ cm^{3}[/tex]

The volume of the cube is equal to

[tex]V=x^{3}[/tex]

Find the number of cuboids that are needed

[tex](n)24=x^{3}}[/tex]

n*24 must be a perfect cube

so

The minimum value that satisfied n to make n*24 a perfect cube is n=576

[tex]576*24=13,824=24^{3}[/tex]

Answer:

576 Cuboids

Step-by-step explanation:

Given the parallelogram ABCD, solve for X when angle A equals (30+ 5x)° and angle D equals (15+10x)° degrees. Also, sides AB and CD opposite each other.

Answers

Answer:

  x = 9

Step-by-step explanation:

Adjacent angles A and D are supplementary:

  (30 +5x)° +(15 +10x)° = 180°

  15x +45 = 180 . . . . . collect terms, divide by °

  15x = 135 . . . . . . . . . subtract 45

  135/15 = x = 9 . . . . . divide by the coefficient of x

The value of x is 9.

PLEASE HELP ME!!!
Find p(–5) and p(3) for the function p(x) = 2x5 – 9x4 – 2x2 + 12x – 2. Question 8 options: –11,915; –251 –4,487; –551 –11,985; –225 –11,987; –227

Answers

Answer:

p(-5)=-11,987

p(3)=-227

Step-by-step explanation:

To find the value of the function p(-5) just substitute x=-5 into the function expression instead of x:

[tex]p(-5)=2\cdot (-5)^5-9\cdot (-5)^4-2\cdot (-5)^2+12\cdot (-5)-2=\\ \\=-6,250-5,625-50-60-2=-11,987[/tex]

To find the value of the function p(3) just substitute x=3 into the function expression instead of x:

[tex]p(3)=2\cdot 3^5-9\cdot 3^4-2\cdot 3^2+12\cdot 3-2=\\ \\=486-729-18+36-2=-227[/tex]

Answer with Step-by-step explanation:

We are given a function:

[tex]p(x) = 2x^5-9x^4-2x^2+12x-2[/tex]

We have to find the value of p(-5) and p(3)

[tex]p(-5) = 2\times (-5)^5-9\times (-5)^4-2\times (-5)^2+12\times (-5)-2\\\\=-6250-5625-50-60-2\\\\=-11987[/tex]

[tex]p(3) = 2\times 3^5-9\times 3^4-2\times 3^2+12\times 3-2\\\\=486-729-18+36-2\\\\=-227[/tex]

Hence, p(-5)= -11987

and p(3)= -227

HELP PLEASE! ONLY 5 MORE MINUTES! Look at the following shape below: Please find the PERIMETER of the following shape using the correct formulas. Use 3.14 for pi.

Answers

Answer:

The perimeter is [tex]P=73.12\ cm[/tex]

Step-by-step explanation:

we know that

The perimeter of the figure is equal to the circumference of a semicircle

plus the perimeter of a square minus the diameter of the circle

so

[tex]P=\pi r+4(b)-D[/tex]

we have

[tex]r=8\ cm[/tex]

[tex]b=16\ cm[/tex]

[tex]D=16\ cm[/tex]

The diameter of the circle is equal to the length side of the square

substitute

[tex]P=(3.14)(8)+4(16)-16[/tex]

[tex]P=25.12+64-16[/tex]

[tex]P=73.12\ cm[/tex]



The perimeter of a rectangular garden is 64 centimeters. The length of the garden is three times the width. Find the length
and the width

Answers

Answer:

width 8 centimeters

length 24 centimeters

Step-by-step explanation:

L=3W : equation a       .

W=64/xW : equation b .

x=2L+2W                       .

 =2(3W)+2W                  .

x=8W                              .

Answer:

Length = 24 cm

and, Width = 8 cm

Step-by-step explanation:

It is given that,

Length = 3 × (width)

⇒ L = 3W        → (1)

Also, since perimeter = 64 cm

And perimeter of rectangular garden = 2(L + W) = 64

From equation (1)

2(3W + W) = 64

2 × 4W = 64

⇒ 8W = 64

⇒ W = 8 cm

Putting value in equation (1)

L = 3 × 8 = 24 cm

thus, Length = 24 cm

and, Width = 8 cm

I need help


You find 20 books that you checked out from the library as you are cleaning your room. You need to take 4 books back to the library, and you want to set them aside in a pile on your desk.  


How many ways can 4 of the 20 books be arranged in a pile?

Answers

Answer:

the answer is 20P4 = 4845

Step-by-step explanation:

Answer:

There are 20 ways to pick the first book, 19 ways for the second

Step-by-step explanation:

If order of the 4 books does not matter then

₂₀C₄ = 20! / (20-4)!4! = 20!/(16!*4!) = 4845 ways

Adelia drove from her house to Townsville one evening. Her distance was 180 miles. She left home at 6:27 and was at townsville at 6:42 what was her speed

Answers

Answer: 720 mph or 12 miles a minute

Step-by-step explanation:

Answer:

60

Step-by-step explanation:

(I actually have the problem in front of me, and I think you switched the minute and hour hands on the clock)

Adel

left at 5:30 and arrived at 8:30. That’s 3 hours, which is 180 minutes. 180/180 = 1 mile per minute

60 minutes in an hour

60*1 = 60 mph

The LAST QUESTION PLEASE HELP
The position d of a block that is attached to a spring is given by the formula d=6cos(pi/2 t) where t is in seconds. What is the maximum distance of the block from its equilibrium position (the position at which d = 0)? Find the period of the motion.

Answers

Step-by-step explanation:

Waves have the form:

y = A sin (2π/T x + φ) + B

where A is the amplitude (the distance from the center of the wave to the max or min),

T is the period (time it takes for one cycle),

φ is the phase shift (moves the wave left or right),

and B is the offset (moves the wave up or down).

This can also be written with cosine.

Here, we have d = 6 cos(π/2 t).

The amplitude is A = 6, so the maximum distance from the equilibrium position is 6 units.

The period is:

2π / T = π/2

T = 4

So the period is 4 seconds.

Need help with a math question

Answers

Answer:

There are 10 possible ways the student can schedule the three classes

Step-by-step explanation:

The college student is choosing 3 classes to take during the first, second, and third semester from 5 electives.

Therefore, the student is choosing 3 items from a total of 5 and the order is not of key concern here. This is thus a combination problem;

5C3 = 10

read as 5 choose 3

The above mathematical operation can be performed using any modern calculator.

Find the slope of the line on the graph. Write your answer as a fraction or a whole number, not a mixed number or decimal.

Answers

The slope is 2/3

The rise from one point to another is 2, and the run is 3 and since slope is rise/run, the slope is 2/3

Answer: The slope of the line is: [tex]\frac{2}{3}[/tex]

Step-by-step explanation:

The slope can be calculated with this formula:

[tex]m=\frac{y_2-y_1}{x_2-x_1}[/tex]

You need to choose two points of the line. You can pick the point (6,2) and the point (-6,-6)

You can identify that:

[tex]y_2=-6\\y_1=2\\x_2=-6\\x_1=6[/tex]

Now, you must substitute these values into the formula:

[tex]m=\frac{-6-2}{-6-6}[/tex]

With this procedure you get that the the slope of the line on the graph is:

[tex]m=\frac{-8}{-12}[/tex]

[tex]m=\frac{2}{3}[/tex]

Since we have computer algebra systems that can solve polynomial division problems for us, why is it necessary to learn how to do these things by hand?

Answers

Answer:

Probably because learning to do polynomials by hand boosts understanding of the topic and improves general algebraic solving ability,both of which are required in further topics like advanced calculus and algebra

Final answer:

Learning polynomial division by hand is crucial for understanding concepts, enhancing problem-solving skills, and fostering critical thinking in mathematics.

Explanation:

The importance of learning polynomial division by hand despite the availability of computer algebra systems lies in developing a deep understanding of the underlying concepts, fostering problem-solving skills, and enabling visualization of geometric interpretations.

By manually carrying out mathematical operations, students can better grasp the logic behind the processes, which aids in building a strong foundation for more complex mathematical tasks.

Furthermore, mastering hand calculations equips students with the ability to perform quick mental math, apply critical thinking skills, and comprehend the practical applications of the mathematical concepts.

On a number line the directed line segment from Q to S has endpoints Q at -14 and S at 2. Point R partitions the directed line segment from Q to S in a 3:5 ratio.

Which expression correctly used the formula, to find the location of point R?

Answers

Answer:

Step-by-step explanation:

The distance from Q to S is 2 - (-14), or 16.

We start at point Q.  Note how 3 and 5 add  up to 8, which allows us to write:

R = Q + (3/8)(16), or R = -14 + 6, or R = -8.

From R to S it is (5/8)(16), or 10 units.

The directed line segment is partitioned into segments of lengths 6 and 10, whose combined length is 16, as expected.

Answer:

14/5 or A

Step-by-step explanation:

I just took this assignment.

Use the figure to answer the questions

a. Explain why the triangles are similar

Geometry - Shaping Sheet
Triangle ______ and Triangle ______ are similar by the __________ postulate. This postulate works because __ (explain your reasoning here) ________.
*Use this format to appropriately write your answer below this box.

b. Find the value of x

Answers

Answer:

A. EAB and EDC by AAA because congruent corresponding angles lead to similar triangles regardless of side length. This postulate works because the parallel lines cause angle a and angle d to be congruent as well as angle b being congruent to angle c, and vertical angle e is congruent.

Step-by-step explanation:

When probability is not found by considering all possible outcomes, but by testing and experimentation, it is called _____ probability.

Answers

Answer:

Step-by-step explanation:

Observational probability

Please answer this multiple choice question correctly for 30 points and brainliest!!

Answers

Answer:

  D.  64 and 81

Step-by-step explanation:

The best benchmarks are the ones that are the closest to the value you want the root of. Perfect squares in that neighborhood are ...

7² = 498² = 64your number = 709² = 8110² = 100

The closest are 64 and 81.

The probability that a random variable is greater than or equal to z standard deviations from the mean in a standard normal distribution is p%. What can be said with certainty about the probability that the random variable is less than or equal to –z standard deviations from the mean?

Answers

Answer:

The right answer is B: The probability is equal to p%.

Step-by-step explanation:

Points A and B have coordinates (3,1,2) and (1,-5,4) respectively. Point C lies on line AB such that AC:BC=3:2. Find position vector of Point C.

Final answer is (-3,-17,8)

Answers

Answer:

The position vector of point C is <-3 , -17 , 8> or -3i - 17j + 8k

Step-by-step explanation:

* Lets revise how to solve the problem

- If the endpoints of a segment are (x1 , y1 , z1) and (x2 , y2 , z2), and

 point (x , y , z) divides the segment externally at ratio m1 :m2, then

 [tex]x=\frac{m_{1}x_{2}-m_{2}x_{1}}{m_{1} -m_{2}},y=\frac{m_{1}y_{2}-m_{2}y_{1}}{m_{1}-m_{2}},z=\frac{m_{1}z_{2}-m_{2}z_{1}}{m_{1}-m_{2}}[/tex]

* Lets solve the problem

∵ AB is a segment where A = (3 , 1 , 2) and B = (1 , - 5 , 4)

∵ Point C lies on line AB such that AC : BC=3 : 2

∵ From the ratio AC = 3/2 AB

∴ C divides AB externally

- Lets use the rule above to find the coordinates of C

- Let Point A is (x1 , y1 , z1) , point B is (x2 , y2 , z2) and point C is (x , y , z)

 and AC : AB is m1 : m2

∴ x1 = 3 , x2 = 1

∴ y1 = 1 , y2 = -5

∴ z1 = 2 , z2 = 4

∴ m1 = 3 , m2 = 2

- By using the rule above

∴ [tex]x=\frac{3(1)-2(3)}{3-2}=\frac{3-6}{1}=\frac{-3}{1}=-3[/tex]

∴ [tex]y=\frac{3(-5)-2(1)}{3-2}=\frac{x=-15-2}{1}=\frac{-17}{1}=-17[/tex]

∴ [tex]z=\frac{3(4)-2(2)}{3-2}=\frac{12-4}{1}=\frac{8}{1}=8[/tex]

∴ The coordinates fo point c are (-3 , -17 , 8)

* The position vector of point C is <-3 , -17 , 8> or -3i - 17j + 8k

A bag contains marbles: 10 2 are green, 3 are red, and 5 are blue. Debra chooses a marble at random, and without putting it back, chooses another one at random. What is the probability that the first marble is red and the second is blue? Write your answer as a fraction in simplest form.

Answers

3/9•5/9=15/81=5/27
Because the first time you can take 3 from 10 marbles, and the second time there are 5 marbles from the 9 marbles left.

How many combinations of 7 candidates can fill 3 vacancies on a city council?

Answers

Answer:

35 combinations

Step-by-step explanation:

You have to use the formula for finding combinations in probability.  It looks like this:

₇C₃ = [tex]\frac{7!}{3!(7-3)!}[/tex]

so that gives you

₇C₃ = [tex]\frac{7*6*5*4!}{3*2*1*4!}[/tex]

The 4 factorials cancel each other out, and when you do the math, you get 210/6.  That divides evenly into 35.  So there are 35 combinations.

Choose the correct reason for each algebraic statement. A. Subtraction Property of Equality B. Combine like terms C. Distributive Property D. Division Property of Equality 3.__ 4.__ 5.__ 6.__

Answers

Answer:

b

Step-by-step explanation:

hope this helps

Solve using elimination PLEASE I NEED HELP!!! IT WOULD REALLY MEAN A LOT IF ANYONE CAN ANSWER THIS! 16 POINTS!!!
2x+4y=1
x-4y=5

Answers

Answer:

  (x, y) = (2, -3/4)

Step-by-step explanation:

The point of the "elimination" technique is to combine the equations in a way that eliminates one of the variables. Sometimes this involves multiplying one or both of the equations by constants before you add those results together. In any event, the first step is to look at the coefficients of the variable terms to see if there is a simple combination of them that will result in zero.

The y terms have coefficients that are opposites of each other (4, -4), so you can simply add the two equations to eliminate y as a variable.

  (2x +4y) +(x -4y) = (1) +(5)

  3x = 6 . . . . . simplify

  x = 2 . . . . . . divide by 3

Now, you find y by substituting this value into one of the equations. I would choose the equation with the positive y-coefficient:

  2(2) +4y = 1

  4y = -3 . . . . . . subtract 4

  y = -3/4

Then the solution is ...

  (x, y) = (2, -3/4)

_____

A graphing calculator confirms this solution.

PLEASE HELP ME
There are two answers!

x=-3
x = -2


x = -1


x = 0


x = 1


x = 2


x = 3

Answers

Answer:

x = 0x = 1

Step-by-step explanation:

Find two rows in the table that have the same values in the f(x) and g(x) columns.

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