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natta225 [31]
3 years ago
12

In how many ways can a teacher arrange five students in the front row of a classroom with a total of 20 students

Mathematics
1 answer:
Nataly [62]3 years ago
6 0
Select 5 students from 20 
means 20P5
<span>=1860480</span>
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15. yes. AB = EF = 3

16. yes. BD = DF = 8

17. no. AC = 5, CD = 6

18. yes. AC = DE = 5

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3 0
1 year ago
PLEASE HELP ASAP!!!!!
attashe74 [19]
For this case what we must do is use the law of cosines.
 We then have the following equation:
 c ^ 2 = a ^ 2 + b ^ 2 - 2 * a * b * cos (x)&#10;
 Where,
 a, b: sides of the triangle
 x: angle between sides a and b.
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 c^2 = 90^2 + 75^2 - 2*90*75*cos(85)&#10;
 Clearing the value of c we have:
 c =  \sqrt{ 90^2 + 75^2 - 2*90*75*cos(85)}
 Answer:
 
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c = \sqrt{ 90^2 + 75^2 - 2*90*75*cos(85)}
7 0
3 years ago
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