1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Rasek [7]
3 years ago
9

A man buys four books from the store and a preferred reader discount card for $20. Later that day, he goes back and buys five mo

re books. He also got $5 discount using his new card. If he spent a total of $87 at the bookstore, how much did each book cost assuming every book cost the same amount?
Mathematics
1 answer:
AleksAgata [21]3 years ago
4 0

Let x be the cost of each book.

So, the cost of 4 books is 4x.

For the purchase of 4 books, he got a discount of $20.

So, the amount he paid for the first four books = 4x - 20.

Now, the cost of 5 books is 5x.

For the purchase of 5 books, he got another discount of $5.

So, the amount he paid for the five books = 5x - 5.

Total money spent = $87.

Therefore, (4x - 20) + (5x - 5) = 87

4x + 5x - 20 - 5 = 87

9x - 25 = 87

9x = 87 + 25

9x = 112

Divide both sides by 9.

x = 12.4

Hence, the cost of each book = $12.4.

You might be interested in
What does a linear function look like
Y_Kistochka [10]
Y= f(x) = a+bx
example: f(x) = 3x+2
6 0
2 years ago
Read 2 more answers
6.2x + 8 = 3(1.4x -4) What are the steps to solve this problem?​
Anettt [7]

Hello friend ,. I hope it's helps you

enjoy your day

5 0
2 years ago
Read 2 more answers
Mark jumped 6 feet 9 inches in the long jump competition and George jumped 8 feet 4 inches. How many inches farther did George j
VLD [36.1K]

Answer:

1 foot and 5 inches.

Step-by-step explanation:

He jumped 6 ft. 9 inch. 6.9+1.5 = 8.4

8 0
3 years ago
Read 2 more answers
What is the z value in W×(-4+z)=mz+17
Irina-Kira [14]
There value for z would be 3-5
5 0
3 years ago
Which expression is equivalent to StartFraction b Superscript negative 2 Baseline Over a b Superscript negative 3 Baseline EndFr
nignag [31]

Answer:

  • \frac{b^{-2}}{ab^{-3}}=\frac{b}{a}

Step-by-step explanation:

Writing the description in algebraic translation

\frac{b^{-2}}{ab^{-3}}

so we have to find the expression which will be equal to \frac{b^{-2}}{ab^{-3}}.

Considering the expression

\frac{b^{-2}}{ab^{-3}}

\mathrm{Apply\:exponent\:rule}:\quad \frac{x^a}{x^b}=x^{a-b}

\frac{b^{-2}}{b^{-3}}=b^{-2-\left(-3\right)}

so the expression becomes

=\frac{b^{-2-\left(-3\right)}}{a}            ∵ \frac{b^{-2}}{b^{-3}}=b^{-2-\left(-3\right)}

\mathrm{Subtract\:the\:numbers:}\:-2-\left(-3\right)=1

=\frac{b}{a}

Therefore,

                    \frac{b^{-2}}{ab^{-3}}=\frac{b}{a}

7 0
3 years ago
Read 2 more answers
Other questions:
  • Write 29/5 as a mixed number
    9·1 answer
  • Help me with part A<br>please
    9·2 answers
  • given the numbers 6, 8, 10, and 20, what number when added would make the average of all five numbers 12? 1. (4) 2. (10) 3. (16)
    14·2 answers
  • Can someone help please?!?
    15·1 answer
  • For the function f(x)=1/x-2 +5 notice that a=1, h=2, k=5
    10·1 answer
  • A plane cuts through a cone perpendicular to the base of the cone. What shape is formed by this intersection
    10·1 answer
  • For carolina's birthday her mom took her and her friends to a water park.Carolina mom paid 42.50 for 5 students tickets. What wa
    15·1 answer
  • If APTS – APQR, find the value of x.<br> 3x - 8<br> P<br> 28<br> T<br> 21<br> x +11<br> S<br> R
    13·1 answer
  • -3m + 5&gt;26<br> How to work
    10·1 answer
  • Sarina borrowed $5,800 at a simple interest rate of 7½% per year. After a certain number of years she had paid $1,305 in interes
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!