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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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2 years ago
Find the sum of natural number from 1 to 30
Ierofanga [76]

Answer:

1. sum of term = 465

2. nth term of the AP = 30n - 10

Step-by-step explanation:

1. The sum of all natural number from 1 to 30 can be computed as follows. The first term a = 1 and the common difference d = 1 . Therefore

sum of term = n/2(a + l)

where

a = 1

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n = number of term

sum of term = 30/2(1 + 30)

sum of term = 15(31)

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2.The nth term of the sequence can be gotten below. The sequence is 20, 50, 80 ......

The first term which is a is equals to 20. The common difference is 50 - 20 or 80 - 50 = 30. Therefore;

a = 20

d = 30

nth term of an AP = a + (n - 1)d

nth term of an AP = 20 + (n - 1)30

nth term of an AP = 20 + 30n - 30

nth term of the AP = 30n - 10

The nth term  formula can be used to find the next term progressively.  where n = number of term

The sequence will be 20, 50, 80, 110, 140, 170, 200..............

6 0
3 years ago
URGENT!!!!!!!! 40 POINTS AND BRAINLIEST!!!!!!!!
gayaneshka [121]

Answer:

its c because parallel lines are lines  that are always the same distance apart all of these are the same distance apart

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8 0
2 years ago
Read 2 more answers
I just need someone to answer these:
VladimirAG [237]

Answer:

7x4/8=3.5

9 × 7/10=6.3

(i dont know this one or the next, hope it helps! ❤

Step-by-step explanation:

7 0
3 years ago
Read 2 more answers
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