Mathematics Middle School

A library is having a used book sale. All hardcover books
have the same price and all softcover books have the
same price. You buy 4 hardcover books and 2 softcover
books for $24. Your friend buys 3 hardcover books and
3 softcover books for $21. What is the cost in dollars of a
hardcover book?

Answers

Answer 1

Answer:  It should cost $5

Step-by-step explanation:

First you have 4 hardcover and 2 softcover, so 4x+2y= $24 and for your friend it would be 3x+3y= $21.

You have

(3x+3y)2  = 72

(4x+2y)3  = 42

Then subtract them which is 30 you would divide by 6 since 3x2=6

Which gets you to 5.

Answer 2
You have 4 hardcovers and 2 soft covers... soo the equation would be 4x+2y=$24
for the friend the equation would be 3x+3y=$21

Related Questions

What is the distance between −3 and 0? I dont know I got confused

Answers

Answer:

The distance between -3 and 0 is 3.

Step-by-step explanation:

1. First off, draw a number line. Be sure to plot -3 and 0.

2. Count how many numbers are between -3 and 0.

You will see that there is 3.

-3, -2, -1, and then 0.

1, 2, 3 distances apart.

The answer is 3 because the length from 0 to -3 would be 3.

Find the Median. pls

Answers

Answer:

The median is 56

Step-by-step explanation:

50, 52, 52, 55, 56, 56, 56, 58, 58, 59, 60

Then you start eliminating

1. 52, 52, 55, 56, 56, 56, 58, 58, 59

2.52, 55, 56, 56, 56, 58, 58

3. 55, 56, 56, 56, 58

4. 56, 56, 56

5. 56

6. So, the median is 56.

Hope this helped!

What is the total surface area of the prism below? (Can I pls get the whole problem solved step by step, most of it!)

Answers

Answer:

672

Step-by-step explanation:

Okay so, the surface area of a figure is just all the areas of the faces added together. The front face ( 9x16 ) would be 144. The back face would be 12x9 or 109. The base would be 20x9 or 180. Now, this is where it might get tricky. The triangles will be 12x20x0.5 or 1/2. The answer for that would be 120. Now since there are two, multiply the 120 by two. ( Technically, since there are two of the same triangles you would not need to multiply by 0.5, but just to be safe i'll do it here. )  Finally, add all the areas together. The final answer is 672. Hope this helps!

672 is the answer sorry if wrong

Marjory practiced the piano for 12 minutes. How many seconds did she practice?

72 seconds
550 seconds
720 seconds
1,200 seconds

Answers

Answer : 720 Seconds

Answer:

C: 720 seconds

Step-by-step explanation:

I got it correct on a quiz I did that had this question.

PLS HELP I REALLY CAN'T FAIL I'LL GIVE OUT A BRAINLIEST!!!

Answers

the answer should be 1848.26 this is because you take the balance and subtract all the withdraws with it then you add all the deposits with it
I believe this is your answer
1,848.46

PPPPPPPPLLLLLLLLLLEEEEEEEEASSSEEEEE help

Answers

the answer is C bc it’s multiplication

Answer:

the answer is C

Tommy went to the store to buy 13 bricks. If he left at 11:00 am and the store is 15 minutes away, what time will Tommy get back home?

pls help qwq, first to answer gets brainliest or however it's spelt lol

Answers

Answer:

11:30

Step-by-step explanation:

The store is 15 mins away, so 30 mins is the round trip.

Have a nice one.

Answer: 11:15

Step-by-step explanation:

i think

6. Help me please and thanks
Xxxxxx

Answers

Step-by-step explanation:

in a rect.

b:l=1:4

let,

"x" & "4x"

perimeter=20cm

thus,

2(l+b)=20

x+4x=20/2

5x=10

x=10/5

x=2

also

4x=4×2

=8

also ,area=

l×b

=8×2

=16

thus,area=16

A mix in ice cream shop charges $3.00 a cup with each mix in costing an additional $1.50. Which equation shows the relationship between y, the total cost, and x, the number of mix ins?

Answers

The answer is 1.50x+3.00=y

PLEASE HELPPPP (with steps)

Answers

Answer:

the answer is x=-25/56

Step-by-step explanation:

2 4/5x=-1 1/4

14/5x=-5/4

x=-25/56

please help! please!!

Answers

Answer:

21.5

16.5

10.5

1.5

3.5

7.5

Step-by-step explanation:

69 - 90.5 = -21.5 = 21.5

74 - 90.5 = -16.5 = 16.5

80 - 90.5 = -10.5 = 10.5

92 - 90.5 = 1.5

94 - 90.5 = 3.5

98 - 90.5 = 7.5

Helpppppppppppppppp plzz:))

Answers

Answer:

51.80

Step-by-step explanation:

I’ll give brainliest but plz help me I would be so grateful!

Answers

Answer:

1. a

2. c

3. e

Step-by-step explanation:

1. a because she ran 5 miles on friday and ran x miles before friday. we know she had ran a total of 20 miles so we have x+5=20

2. there is a total of 20 clubs andre's school, 5 times more than is cousin's school. we have 20 =5x

3. 20 cats get 5 cups of food. each got an x amount. we get 5 =20x

1. is a
2. is c
3. is e

an apartment complex has 20 apartments. The number of bedrooms is represented in the box-and-whisker plot as shown


label all the following values:
(a) median
(b) lower quartile and upper quartile
(c) minimum and maximum

Answer:

Answers

It seems like the answer is a
The median is 3.0
The lower and upper quartiles are 2.25 and 4.75
I’m not sure about minimum and maximum though although it might be 0 and 6

(No Links!) Describe the sequence of transformations that maps PQR onto P’Q’R’. Use the drop-down menus to explain your answer.

Options for the first box are (270°) (180°) (90°) (45°)

Options for the second box are (1 unit down) (2 unit down) (1 unit up) ( 2 unit up)

Answers

Answer:

First box: 180 degrees

Second box: 1 unit down

Step-by-step explanation:

After it is rotated, you will have to move it 1 unit down again.

First box is 189 degrees sorry if wrong it might be the answer

!HELP ASAP WOULD BE APPRECIATED! The expression to find the perimeter of a rectangle is 2(length + width). What is the perimeter, in units, of a rectangle of length fraction 1 over 7 unit and width fraction 1 over 2 unit?

fraction 1 and 1 over 7 units
fraction 1 and 2 over 7 units
fraction 4 over 9 unit
fraction 2 over 9 unit

Answers

Answer:

ok im not sure this is the right answer to your specific question, because i dont understand the wording to well, but here...

for 1/7 and 1/2 it would be 2/7 and 1 (whole)

for 1 and 1/7 it would be 2(whole) and 2/7

for 1 and 2/7 it would be 2(whole) and 4/7

for 4/9 it would be 8/9 and x

and for 2/9 it would be 4/9 and x

sorry if thats not the question :)

EDIT: its the second one because

2*1/7= 2/7

and 1/2*2=1

What is the surface area of this prymaid?

Answers

Answer:

33 ft^2 so the 4th option I’m pretty sure if I’m not I’m so sorry

Step-by-step explanation:

Answer:

it think the third answer would be right i.e 36 ft

Given: Triangle ABC is a right triangle.
Prove: a^2 + b^2 = c^2

Answers

Answer:

what?

Step-by-step explanation:

Help Me With Functions Part 4.

Answers

Answer:

for this one, your answer will be B.X

Step-by-step explanation:

It is X because each element in x is mapped to exactly one element in y.

In X 6 maps to 4,2; in y 6 maps to 6,2; in Z 7 maps to 2,8.

so every element in x should map to exactly one element in y and it is possible only in the set X so the answer is X.

hope it helps....

have a great day.

For this one It will be B.X

if x+a=a+x=x for all value of x,what is the value of a?

Answers

Answer:

Wouldn't a=a

Step-by-step explanation:

from what Im thinking, x is negative and a is positive, so now it is (-) + (+) = (+) + (-) = (+), I dont really understand this question

hi help me

no links pls

Answers

find the five on the bottom line the go up four spaces that would be your plot

Go to the right on the bottom to 5 and go up four and place your dot.

the new shown represents what geometric solid ?

Answers

Octagon geometric solid that has 8 sides
The new shown geometric solid is a Rectangular prism

Which situation CANNOT be represented by the equation x + 18 = 52

A. Madison and Jeremiah made 52 cupcakes for the school bake sale. Madison made 18 cupcakes. How many cupcakes x Jeremiah make? B. Selena has 52$`to spend at the store. She brought a new shirt for 18$ and a new pair of shoes. HOw much x did the new shoes cost?
C. Andrea has to read 52 pages per week for homework. On Monday night she reads 18 pages. How many pages x does Andera still needs to read? D. Leiro has 52 baseball cards he also has 18 football cards. How many total card x does leiro has?

Answers

Answer:

C

Step-by-step explanation:

The equation for C would be 52 - 18 = x.

Answer:

D

Step-by-step explanation:

For D, you would have to ADD 52 to 18.

pls help meeeee :))))

Answers

Answer:

31.4 inches

Step-by-step explanation:

:))

Here are two patterns made using identical rhombuses. Without using a protractor, determine the value of a and b.

Answers

Answer:

a = 60°

b = 120°

Step-by-step explanation:

First, you can find measure a by using the first shape. There are six rhombuses, and you can use the innermost a of each one to form a circle. A full circle is 360°, so divide 360 by six. The answer is sixty. So on the next shape, the a measurements add up to 120°. Subtract that from the circle: 360 - 120 = 240. And since there are two measurements for b, you would divide 240 by two. The answer is 120.

To check your work, use the knowledge that circles are 360° (the four interior corners of a rhombus will also add up to 360°. 2(120) + 2(60) = 360. Hope this helps! Feel free to ask any questions!

brainly and 30 points

Answers

Answer:

A.)  x=25

Step-by-step explanation:

since these are vertical angles, that means they equal the same

  -  75= (4x-25)

add 25 to both sides in order to isolate 4x

  -   100=4x

divide both sides by 4 in order to isolate the x

  -    25=x or x=25

Answer:

[tex]\huge\boxed{x = 25}[/tex]

Step-by-step explanation:

In these two lines that intersect, we can see that 4 angles are opposite from each other. This means that they are vertical angles and therefore equal. 2 of these angles have values next to them, which happen to be across from each other.

Based on this, we know that they are equal. If we write this as an equation, we can solve it to find the value of x.

75º = (4x - 25)º

Add 25º to both sides of the equation

100º = 4x

Divide both sides of the equation by 4 to isolate x

x = 25

Let me know if you have any questions!

PLS HELP TIMED
Which expressions are equivalent to 4(9+3)?

a
4(12)
b
36 + 3
c
36 + 12
d
4 + (9 + 3)
e
(9 + 3) + (9 + 3) + (9 + 3) + (9 + 3)

Answers

Answer:

b

Step-by-step explanation:

using the distributive property you get b

I believe the correct answer is C) 36+12

The equation is 4(9+3). Because of the fact that the four is on the outside, you can distribute the it so both the 9 and the 3.

9 x 4=36
4 x 3= 12

After doing this you set up your new equation which is 36 + 12!

That’s how I got this answer, hope it helps lol.

The volume of a cube is 64 cubic inches. Which expression represents s, the length of a side of the cube?

Recall the formula Cube volume = s cubed.
s = RootIndex 3 StartRoot 64 EndRoot
s = 64 + 64 + 64
s = StartRoot 64 EndRoot
s = 64 times 64 times 64

Answers

Answer:64x64x64

Step-by-step explanation:

Answer:

a

Step-by-step explanation:

edg

Please do all of the problems, show substitution, and graphing. Dochub is a good place to do this, and any joke answers will be deleted.

Answers

Answer:

This is taking me forever. I normally don't give up but, I am very busy sorry.

Step-by-step explanation:

This is what I got done.

Use +,-,x, ÷ and parentheses to connect the numbers 1,3,5 and 7 such that the result is 24.

Answers

Answer: (3-1)×(7+5)

Step-by-step explanation:

There are mainly several ways to get 24

- 2×12

- 3×8

- 4×6

- add all of them together

- complicated ones can include large numbers minus another large number

Use try-check-revise, to find the way that fits 24

For this question, we used 2×12, which results in (3-1)×(7+5)

Hope this helps!! :)

Please let me know if you have any questions.

(3-1) x (7+5) because 3-1= 2 and 7+5 is 12 then you multiply 2x12 and then you get 24. You should get smart
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