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Harman [31]
2 years ago
7

help please and explain your answer please !!!!!!!!!!! Houston Elementary School is selecting students to be in the winter festi

val show. There are 4 roles left but there are 12 students interested in the roles. How many combinations of the twelve students can be chosen for the four remaining roles? A. 505 B.495 C.48 D.16
Mathematics
2 answers:
frosja888 [35]2 years ago
8 0
See the attached picture for answer:

kiruha [24]2 years ago
6 0

Answer: 495

Step-by-step explanation:

nCr = n!/(n-r)!r!

12C4 = 12!/(12-4)!4!

=12!/8!4!

= 12 ×11×10×9×8! / 8!4!

8! at the numerator will cancel that of denominator

= 12×11×10×9 / 4!

=11880/4×3×2

=11880/24

=495

Therefore; 12C4 = 495

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satela [25.4K]

Answer:x=3 and y=15

Step-by-step explanation:

First, we are told "sum of 5 times one number, x, and 4 times a second number, y, is 75":

5x+4y=75 (1)

Then, we are told "he sum of the two numbers is 18":

x+y=18 (2)

At this point we have our system of equations and now we are able to find the values of x and y.

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Substituting (3) in (1):

5(18-y)+4y=75 (4)

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4 0
3 years ago
Jared buys 3 pounds of chicken at $3.15 per pound and 1 pound of broccoli at $1.40 per pound. How much will it cost to make dinn
zaharov [31]

Answer:

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Money to add: $1.40

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