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
Aleks [24]
3 years ago
5

In a set of dominoes, each piece is marked with two numbers, one on each end. the pieces are symmetrical so that the two numbers

are unordered. that is, the combination (2, 6) and (6, 2) are not distinguishable. how many pieces can be formed using the numbers 1, 2, ... , 12?
Mathematics
1 answer:
ki77a [65]3 years ago
8 0

That would be the number of combinations of of 2 from 12 + the number of doubles ( 1 and 1 , 2 and 2 and so on).

= 12C2 + 12

= (12*11)/ 2 + 12

= 66 + 12 = 78 Answer

You might be interested in
Plot these coordinates and determine the resulting figure. (0, 2) (4, 6) (10, 12) (18, 20) A) circle B) curve C) line D) parabol
inna [77]
We have that

<span>A (0, 2) B (4, 6) C (10, 12) D (18, 20)
</span>
using a graph tool
see the attached figure  

the answer is 
C) line

8 0
2 years ago
Read 2 more answers
3)
Cerrena [4.2K]

Answer:

$500

Step-by-step explanation:

$25 = 5% of x

0.05x = 25

x = 25/0.05

x = 500

Answer: $500

4 0
2 years ago
What is the equation of a line passing through (-3,7) and having a slope of -1/5<br> PLEASE HELP
OLEGan [10]

Answer:

y = -1/5x +32/5

Step-by-step explanation:

The slope intercept form of the equation of a line is

y = mx+b

we know m = -1/5

y = -1/5x+b

We know a x and y on the line

7 = -1/5(-3) +b

7 = 3/5 +b

Subtract 3/5 from each side

35/5 -3/5 = b

32/5 =b

So the equation is

y = -1/5x +32/5

8 0
3 years ago
Which transformation shows a reflection of ADEF? ​
antoniya [11.8K]

Answer: B or the second choice

Step-by-step explanation:

well for triangle DEF since E is on the top left, it should be on the bottom right. While F was on the bottom right, it would be on the top left where E originally was. The angles inside has the same situation with E and F, however D stills stays at the top because when reflected like a mirror, D stays at the top. Sorry it’s long and hope this helps!


PS u also took a pic of the correct answer lol XD

3 0
2 years ago
A person runs 1/8 mile in 1/64 hour.<br> The person's speed is (BLANK) miles per hour.
snow_tiger [21]

Answer: The person's speed is 8 miles per hour.

Step-by-step explanation:

To solve we want to convert the \frac{1}{8} and \frac{1}{64} proportionally for the number of miles per hour. We know that multiplying a fraction by its reciprocal will equal 1. So let's do that for the value of the hour.

\frac{1}{64}×\frac{64}{1} =\frac{64}{64} =1

Since we multiplied that to the number of hours we must also do that for the number of miles.

\frac{1}{8}×\frac{64}{1} =\frac{64}{8} =8

7 0
1 year ago
Other questions:
  • What is the equation of the inverse function A(n)=3n-20
    15·1 answer
  • Which polygon will always be irregular?
    8·2 answers
  • The rectangle below has an area of x^2-16 meters and the width of x+4 meters what expression represents the length of the rectan
    7·1 answer
  • Use synthetic division <br> f(x)=x^2-8x+30 for x=-1<br><br> F(-1)= ___
    8·1 answer
  • In the diagram, NQ is a diameter of R, mMN= (6x+33), and mNP= (5+10x). Find mMP
    14·1 answer
  • R is inversely proportional to A. R=12 when A=1.5.<br> work out the value of R when A=5
    13·1 answer
  • A family will travel 350 miles from their house in order to reach Dallas TX. Which inequality can be used to find all possible v
    5·1 answer
  • The distance between two cities is 87 km. What is the distance between them on a map drawn at a scale of 1:600,000?
    15·1 answer
  • Evaluate 5x+2y-6 when x=3 and y=2<br> show how you got the answer
    9·2 answers
  • Evaluate the expression when, m=-2<br><br> m²-6m-5<br><br> (Thank you for your help!)
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!