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arsen [322]
3 years ago
14

HELP!

Mathematics
2 answers:
Ber [7]3 years ago
5 0

Answer:

U think the answer is C.

Marianna [84]3 years ago
3 0

Answer:

Number of ways of selecting two students is 15

Step-by-step explanation:

number of ways of selecting n out of r  is given by

n_{C_{r} } =\frac{n!}{r!(n-r)!}

It is given that there are 6 seniors on student council.

2 students are selected for district meeting

So we have  n= 6 and r=2

number of ways of selecting two students =6_{C_{2} }

                                                                       =\frac{6!}{2!(6-2)!}

                                                                       =\frac{6!}{2!4!}=15

So we have number of ways of selecting two students is 15

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<span>A midpoint divides a line or a segment into two equal parts. If D is the midpoint of the segment AC and C is the midpoint of segment DB, what is the length of the segment AB, if AC = 3 cm.</span>

 

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If C is the midpoint of DB, then DC=CB

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vova2212 [387]

Look at the picture.

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We have the system of equations:

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