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
Ann [662]
3 years ago
12

There are 13 books on a shelf. 4 of these books are new.

Mathematics
2 answers:
Stells [14]3 years ago
7 0
The ratio of used books to new books is 9:4 because 13-4=9 and the ratio of all books to used books is 13:4 because there are 13 total books and 4 used books
Readme [11.4K]3 years ago
7 0
Hey there!

13 shelfs, and 4 are used . . .

13 - 4 = 9

This means that 9 of the books are used.

9 + 4 = 13

The ratio is 9:4 <-----------

Hope this helps you.
Have a great day!
You might be interested in
Write the standard equation for the circle
saw5 [17]

Answer:

The standard form of a circle's equation is (x-h)² + (y-k)² = r² where (h,k) is the center and r is the radius.

Step-by-step explanation:

3 0
2 years ago
Which transformation shows that the two given circles are similar?
gregori [183]
Circle A -- center(2, 0), radius 8 Circle A' -- center(-1, 5), radius 3
3 0
3 years ago
Construye un rectángulo de 12 cm de altura y 5 cm de ancho (Píntalo). Luego a) Calcula el perímetro del rectángulo. B) Calcula e
lara [203]

Step-by-step explanation:

Build a rectangle 12 cm high and 5 cm wide (Paint it). Then a) Find the perimeter of the rectangle. B) Find the area of ​​the rectangle. Aiuda porfis.

Length of the rectangle is 12 cm

Breadth of the rectangle is 5 cm

Perimeter is the sum of all sides. For rectangle it is given by :

P = 2(l+b)

⇒ P=2(12+5)

P = 34 cm

Area of a rectangle is equal to the product of its length and breadth.

So,

A = lb

A = 12 cm × 5 cm

⇒A = 60 cm²

Hence, perimeter is 34 cm and area of rectangle is 60 cm².

8 0
3 years ago
Use the Counting Principle to find the probability. Choosing the 7 winning lottery numbers when the numbers are chosen at random
frozen [14]

Answer:   120

<u>Step-by-step explanation:</u>

Since the order of the numbers doesn't matter we can use the formula:

\dfrac{n!}{r!(n-r)!}\quad \text{where n is the quantity of items and r is the quantity chosen}\\\\\text{In this problem, there are 10 numbers (n = 10) and 7 to be chosen (r = 7)}\\\\_{10}C_{7}=\dfrac{10!}{7!(10-7)!}\\\\.\qquad=\dfrac{10!}{7!3!}\\\\.\qquad=\dfrac{10\times 9\times 8\times 7!}{7!\times 3\times 2\times 1}\\\\.\qquad=10\times 3\times 4\\\\.\qquad=120

7 0
3 years ago
Read 2 more answers
Eight packages of strawberries cost $24. How many packages can you buy for $12
romanna [79]
4 packages, because 24/12=2, 8/2=4 packages.
8 0
3 years ago
Other questions:
  • 253,761 In Expanded Form .
    12·1 answer
  • Anybody know how to solve this?
    9·2 answers
  • In the diagram, m_COE = 55°. If m2 = 2x and mz3 = x+10, what is the measure of angle 2?
    13·1 answer
  • What is the slope of the line shown?<br><br> -7/9<br> 9/7<br> 7/9<br> -9/7
    13·1 answer
  • How do you find a slope of a line using only two points??
    12·2 answers
  • HELP I don't understand please
    15·2 answers
  • Matter is in a liquid state when its temperature is between its melting point and its boiling point. Suppose that some substance
    11·1 answer
  • 7. All of the following are perfect square trinomials EXCEPT one. Which is it?
    7·1 answer
  • Does the graph represent function?
    9·1 answer
  • Please help 40 POINTS
    12·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!