answer.
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
Vadim26 [7]
1 year ago
9

On a website selling books, three paperback books and five hardcover books cost $80.10, and seven paperback books and four hardc

over books cost $100.65. What is the total cost of one paperback and one hardcover book?
Mathematics
1 answer:
Lisa [10]1 year ago
3 0
To answer this kind of question, you need to insert the first equation into second equation or vice versa. The equation from the question should be:

1. 3 paperback books +  5 hardcover book = $80.10
2. 7 paperback books + 4 hardcover book= $100.65

It would be easier to convert the 1st equation into
5 hardcover book = $80.10- 3 paperback books
hardcover book= $16.02- 0.6 paperback books

Then insert it to 2nd equation:
7 paperback books + 4 ($16.02- 0.6 paperback books)= $100.65
7 paperback books + $64.08- 2.4 paperback books= $100.65
4.6 paperback books = $100.65-  $64.08= $36.57
paperback book= $7.95

Insert paperback book price to the first equation to find the hardcover book price
3 paperback books +  5 hardcover book = $80.10
3 ($7.95)+  5 hardcover book = $80.10
5 hardcover book = $80.10 - $23.85= $56.25
hardcover book = $11.25

Then one paperback and one hardcoverbook= $7.95 + $11.25= $19.20 
You might be interested in
Consider the following equation, bh+hr=25 when solving for r
Komok [63]
Solve for r.

You want to get r by itself on one side on the equal sign.

bh + hr = 25

Subtract bh from both sides.

hr = 25 - bh

Divide h on both sides.

r = 25 - bh / h

The two h's cancel each other out.

r = 25 - b

Hope this helps!
4 0
1 year ago
Read 2 more answers
Tom buys a torch and a battery.
nevsk [136]

Answer:

battery costs: 0.39...............

8 0
1 year ago
How much power is produced by a flashlight that has a voltage of 12 volts and a current of 6.5 × 10-2 amps?
Jlenok [28]

Answer:

0.78 Watts is correct answer.

Step-by-step explanation:

Formula:  

P=V*I  

=12*(6.5*10^-2)  

= 12*0.065  

=0.78 Watt.  

3 0
1 year ago
Read 2 more answers
Clarissa helps her mom put the 200-Newton lawn mower in the back of her mom’s truck. They lift the mower up from the ground to t
Mice21 [21]

Answer:

220 N * m or 220 J

Step-by-step explanation:

We have that the work formula would be the applied force multiplied by the distance traveled, that is:

W = F * d

In this case the F is 200 N and the distance is 1.1 meters, therefore we replace:

W = 200 * 1.1

W = 220 N * m = 220 J

Therefore the work carried out by Clarissa and her mom is 200 joules.

6 0
2 years ago
Let ff be the function given by f(x)=e2x−1 x f(x)=e2x−1 x. Which of the following equations expresses the property that f(x)f(x)
navik [9.2K]

Answer:

Step-by-step explanation:

\lim_{x \to \ 0} \frac{e^{2x}-1 }{x} \\= \lim_{x \to \0} \frac{e^{2x}-1 }{2 x}  *2\\\rightarrow2 log e\\\rightarrow 2

5 0
2 years ago
Read 2 more answers
Other questions:
  • For two days in a row Alvin jogged in the park he jogged for 46 min on Friday this is 19 min less than he ran on Saturday write
    6·1 answer
  • Which of the following prime factorizations represents the greatest common factor of 162, 378, and 414?
    9·2 answers
  • If -50c+6=-69, what is the value of 6c-15
    8·1 answer
  • Find the sum of the infinity of the Gp <br>3, 3/10, 3/100 <br>pls i need a step by step solution ​
    8·1 answer
  • What value of n makes the equation true? -1/5n + 7 =2
    7·2 answers
  • Which figure is similar to the parallelogram? (Figures may not be drawn to scale.) A parallelogram has side lengths of 8 and 5.8
    7·2 answers
  • A contractor is in charge of hiring people for a construction project. The number of days it would take to complete the project
    13·1 answer
  • If the end behavior is increasing to the left, what might be true about the function? Select all that apply.
    6·1 answer
  • Iliana signed up for a store credit card with no annual fee to get a discount of 12.5 percent off her entire first purchase.
    14·2 answers
  • Toni and Nicky each earn a weekly salary
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!