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
nika2105 [10]
3 years ago
12

Can someone break this down for me!! I'm stuck

Mathematics
1 answer:
nadya68 [22]3 years ago
4 0

Answer:

_{12}C_9=220

Step-by-step explanation:

Recall the definition for the combination symbol with the use of factorial (symbol !):

_nC_k=\frac{n!}{k!(n-k)!}

Therefore, for the case where n = 12 and k = 9, we have:

_{12}C_9=\frac{12!}{9!(3)!}\\_{12}C_9=\frac{12*11*10*9*8*7*6*5*4*3*2}{9*8*7*6*5*4*3*2(3*2)}\\\\_{12}C_9=\frac{12*11*10}{3*2}\\\\_{12}C_9=\frac{1320}{6}\\\\_{12}C_9=220

You might be interested in
Henry knows that the circumference of a circle is 18mc006-1.jpg inches. What is the area of the circle?
lesantik [10]
The complete question is:
Henry knows that the circumference of a circle is 18π inches. What is the area of the circle?

Solution:
Circumference (C) of the circle can be written as:

C=2 \pi r \\ \\ 18 \pi =2 \pi r \\ \\ r=9

Using this value of radius, we can find the Area(A) of the circle.

A= \pi  r^{2}  \\  \\ 
A= \pi (9)^{2}  \\  \\ 
A=81 \pi

Therefore, area of the circle having a circumference of 18π inches will be 81π inches²
5 0
3 years ago
Please provide answer and work to show how you got the answer!!
yan [13]
X=8
Here my
Work message me if u have questions

7 0
2 years ago
Read 2 more answers
HEY WANT TO HELP SOMEONE PLZ PM ME IF YOU NEED HELP....ALSO I NEED HELP
Dimas [21]
The answer is 10x - 1380m + z
7 0
3 years ago
X - 32.2 = 18.5 how do you solved this
Salsk061 [2.6K]

x-32.2= 18.5

Add 32.2 to both sides

x-32.2+32.2 = 18.5 + 32.2

x = 50.7

I hope that's help !


Check your answer

replace x by its number

50.7-32.2= 18.5

18.5 = 18.5

so the answer is good .


Please let me know if you have question(s) !


3 0
3 years ago
marathon runner runs26.2 miles at the pace of 6.2 minute per mile round off answer to the nearest minute how long will it take t
Scorpion4ik [409]
There are several methods of rounding, but in this case the 'best' one is probably to round up. Rounding down suggests that Kathy actually ran faster. 

<span>26.2 (mile) * 6.2 (minutes/mile) = 162.44 rounded up => 163 minutes.</span>
3 0
3 years ago
Other questions:
  • Find the quotient of the quantity negative 6 times x to the 2nd power times y to the 8th power plus 12 times x times y to the 3r
    6·2 answers
  • Valentino sells ice cream cones and ice cream tubs.
    15·1 answer
  • Expressions that are equivalent to <br> –<br> 8(q+6).
    9·1 answer
  • Place the steps for finding f -1(x) f(x)=2x+5
    7·1 answer
  • The price of a community pool membership has a one-time sign-up fee and a monthly fee. The price can be modeled by the function
    12·1 answer
  • What is the volume of a rectangular prism with the base of 15 inches, width of 3 inches, and height of 8 inches
    13·1 answer
  • 2. What polynomial must be added to (ab - 5) to obtain (5 - ab)?​
    11·1 answer
  • Show step by step......​
    11·1 answer
  • Y=mx+b how do you find it​
    10·1 answer
  • Find the area of this figure. Round your answer to the nearest hundredth. Use 3.14 to approximate
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!