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adell [148]
3 years ago
7

Hey, my assignment is due in a few hours totally blew over me . Would appreciate some help !

Mathematics
1 answer:
NeTakaya3 years ago
5 0

HOPE THIS HELPS!!!!!!!!!!!!!! :)

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Combinations- how to show that 10C2=10C8
Black_prince [1.1K]
By definition,

{}^nC_k=\dbinom nk=\dfrac{n!}{k!(n-k)!}

We have

\dbinom{10}2=\dfrac{10!}{2!(10-2)!}=\dfrac{10!}{2!8!}=\dfrac{10!}{(10-8)!8!}=\dbinom{10}8

and so

{}^{10}C_8={}^{10}C_2
7 0
3 years ago
A plumber had two pipes. The ratio of the length of the longer pipe to the shorter pipe was 9:2. When he cut 1.65m from the long
Natasha2012 [34]

Answer:

1.1m

Step-by-step explanation:

Let L denote longer pipe and S denote shorter part

given:

L:S = 9:2

or L/S = 9/2

2L = 9S

S = (2/9)L-----(eq 1)

Also given:

L - 1.65 = 3S

L - 3S = 1.65 ----- (eq 2)

By substitution, sub eq 1 into eq 2

L - 3(2/9)L = 1.65

L - (2/3)L = 1.65

L [ 1 - (2/3) ] = 1.65

L/3 = 1.65

L = 1.65 (3) = 4.95  (substitute into equation 1)

S = (2/9)(4.95) = 1.1m

6 0
3 years ago
Pls help :D<br><br> ( #7- it’s a -5 )
jeyben [28]

Answer:

Use rules of logarithms to expand.

Undefined!

Step-by-step explanation:

7 0
3 years ago
How does using a bar diagram help you in predicting the solution to ratio and rate problems
Ludmilka [50]
It shows you how many of one thing to how many to another
8 0
3 years ago
I will give BRAINLIEST! help open the picture!​
geniusboy [140]

Answer:

5/2

Step-by-step explanation:

8 0
3 years ago
Read 2 more answers
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