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
Kamila [148]
3 years ago
6

I ordered some books online for myself and friends. ​Each book costs \$ 13$13 and the store charges a flat rate for shipping of

\$ 20$20. ​ ​Write an expression for the cost of buying nn books.
Mathematics
1 answer:
Sonbull [250]3 years ago
8 0

Answer: 13n + 20

Step-by-step explanation:

The cost of each book is $13. That means that if you end up buying "n" books, cost would be:

= Cost of each book * number of books

= 13 * n

= 13n

You would also get charged a flat rate for shipping of $20 which would be added to the above cost to bring a total of:

= 13n + 20

You might be interested in
Find all values of $x$ such that $\dfrac{x}{x+4} = -\dfrac{9}{x+3}$. If you find more than one value, then list your solutions i
mixer [17]

We start with

\dfrac{x}{x+4} = -\dfrac{9}{x+3}

Assuming that x \notin \{-4,\ -3\} we can cross multiply the equation:

x(x+3) = -9(x+4) \iff x^2+3x=-9x-36 \iff x^2+12x+36=0

You can recognize the perfect square pattern in the quadratic equation:

x^2+12x+36 = (x)^2 + 2\cdot x \cdot 6 + (6)^2 = (x+6)^2

So, we have

x^2+12x+36=0 \iff (x+6)^2 = 0 \iff x+6=0 \iff x=-6

Which is the only solution, with multiplicity 2.

8 0
4 years ago
Read 2 more answers
How many meatballs are required for a party of
Alona [7]

Answer:

Step-by-step explanation:

3 0
3 years ago
Ncoell u better hurry for fre poits<br>pay attention says the teacher<br>what do u say?​
Anit [1.1K]

Answer:

Ok

Step-by-step explanation:

5 0
3 years ago
Read 2 more answers
A sample of blood pressure measurements is taken for a group of​ adults, and those values​ (mm Hg) are listed below. The values
mamaluj [8]

Answer:

Systolic variation coefficient (CVS) = 0.1446 = 14.46%

Diastolic variation coefficient (CVD) =  0.1789 = 17.89%

The variation, with respect to the mean, of the systolic pressure sample is slightly less than the variation of the Diastolic pressures.

Step-by-step explanation:

Systolic Mean (MS) = 127.8

Diastolic Mean (MD) = 73.5

Standard Deviation Systolic (sdS) = 18,486

Standard Deviation Diastolic (sdD) = 13.1508

The coefficient of variation is defined by:

Systolic variation coefficient (CVS) = sdS / MS = 18.486 / 127.8 = 0.1446 = 14.46%

Diastolic variation coefficient (CVD) = sdD / MD = 13.1508 / 73.5 = 0.1789 = 17.89%

Then, it can be concluded that the variation, with respect to the mean, of the systolic pressure sample is slightly less than the variation of the Diastolic pressures.

8 0
3 years ago
A company needs to package 2,400 pencils. A box in the shape of a rectangular prism can hold 60 pencils. A cylindrical container
Agata [3.3K]
If the company used rectangular prisms it would take 40 boxes (2400/60) to hold 2,400 pencils which would cost $20 (40 times 0.50). If they used cylindrical containers, they would need 30 containers (2400/80) for a total of $22.50 (30*0.75).

To minimize the cost the company should go with rectangular prisms as they are the most cost effective.
6 0
4 years ago
Other questions:
  • I don't understand how to do this
    13·1 answer
  • How to write 92,542 in expanded form
    14·2 answers
  • Hannah will role a number cube,labeled 1 through 6,300 times.About how many times could Hannah expect to roll a number less than
    6·1 answer
  • Please help I'm so confused
    8·2 answers
  • If f(x)=3x+12, find the value of x so that f(x) =36
    7·1 answer
  • A bag is filled with green and blue marbles. There are 97 marbles in the bag. If there are 9 more green marbles than blue marble
    14·2 answers
  • Multiply binomial using foil (3x-5x)(x-10)
    10·1 answer
  • What is the Mean Median Mode 1) 81,83,44,91,40​
    8·1 answer
  • can Consider the expresion 6348 how you use distruptive propert and the Gcf to find the equielovent expression? Explain how you
    12·1 answer
  • Solve: <br><br> -2(6)^x=-432
    10·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!