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natta225 [31]
2 years ago
14

ABC Bookstore sells one customer 12 used books and 4 new books for 136. Another customer buys 14 used books for 124. How much is

one used book (u), and one new book (n)?
Mathematics
1 answer:
Lubov Fominskaja [6]2 years ago
3 0

An equation is formed of two equal expressions. The cost of a new book is $7.43, while the cost of an old book is $8.86.

<h3>What is an equation?</h3>

An equation is formed when two equal expressions are equated together with the help of an equal sign '='.

Given the cost of 14 used books is $124. Therefore, the cost of a single used book is,

Cost of single used book(u) = 124/14 = $8.86

Also, the cost of 12 used books and 4 new books is $136. Therefore, the equation can be written as,

12u + 4n = 136

12(8.85) + 4n = 136

106.2 + 4n = 136

n = $7.43

Hence, the cost of a new book is $7.43, while the cost of an old book is $8.86.

Learn more about Equation:

brainly.com/question/2263981

#SPJ1

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Name the algebraic property demonstrated in the example below.
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The algebraic expression x • y • z = y • x • z exhibits the transitive property. Transitive property is applied when rearranging the elements or numbers within a term such that the answer or value is still the same. Transitive property is useful in factoring procedure.
3 0
3 years ago
What is the sum of a 56-term arithmetic sequence where the first term is 6 and the last term is 391?
Sati [7]
S_n=\dfrac{a_1+a_n}{2}\cdot n\\\\a_1=6;\ n=56;\ a_{56}=391\\\\subtitute\\\\S_{56}=\dfrac{6+391}{2}\cdot56=\dfrac{397}{2}\cdot56=397\cdot28=11,116
7 0
3 years ago
Read 2 more answers
(-9) - 9n= (-45) please helpppp!
kozerog [31]

Answer: n=4

Step-by-step explanation:

\left(-9\right)-9n=\left(-45\right)

add 9 to both sides

-9-9n+9=-45+9

-9n=-36

divide both sides by -9

n=4

Brainliest please

8 0
3 years ago
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Please help!!! I’ll give extra points!!!
Reil [10]

Answer:

probably 2.65

Step-by-step explanation:

can't explain cause out of time, sorry!

4 0
2 years ago
Dalia saved $3000 last year. She said $600 in the month of January. What percent of the total amount of money she saved last yea
Anni [7]
1. We assume, that the number 3000 is 100% - because it's the output value of the task. 
<span>2. We assume, that x is the value we are looking for. </span>
<span>3. If 100% equals 3000, so we can write it down as 100%=3000. </span>
<span>4. We know, that x% equals 600 of the output value, so we can write it down as x%=600. </span>
5. Now we have two simple equations:
1) 100%=3000
2) x%=600
where left sides of both of them have the same units, and both right sides have the same units, so we can do something like that:
100%/x%=3000/600
6. Now we just have to solve the simple equation, and we will get the solution we are looking for.

7. Solution for 600 is what percent of 3000

100%/x%=3000/600
<span>(100/x)*x=(3000/600)*x       - </span>we multiply both sides of the equation by x
<span>100=5*x       - </span>we divide both sides of the equation by (5) to get x
<span>100/5=x </span>
<span>20=x </span>
<span>x=20
So 600 is 20% of 3000</span>
7 0
3 years ago
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