Answer:
72
Step-by-step explanation:
The area (A) of a rhombus is calculated as
A = × d₁ × d₂ (d₁ and d₂ are the diagonals )
The diagonals bisect each other at right angles
d₁ = 2 × 6 = 12
Use the tangent ration in the upper left right triangle and the exact value
tan60° =
tan60° = =
=
( multiply both sides by 6 )
opp = 6 , then
d₂ = 2 × 6 = 12
Thus
A = × 12 × 12
= 6 × 12
= 72
Answer:
a) 1,081,575
b) 735,471
c) 1,075,140
d) 0.3159
Step-by-step explanation:
a)
This is a combination of 25 elements taken 8 at a time
b)
Supposing number 1 is the best, if we leave him/her out we will now have 24 employees, so now it is a combination of 24 elements taken 8 at a time
c)
Let's compute the complement of this set and then subtract.
That is to say, compute how many crews do not have any of the 10 best.
This would be a combination of 25-10 = 15 taken 8 at a time
If we subtract this figure from the total of possible crews, we get 1,081,575 - 6,435 = 1,075,140 possible crews with at least one of the 10 best.
d)
From the figure obtained in c) we subtract the figure obtained in b) 1,075,140 - 735,471 = 339,669 and this is the number of crews that do not have number 1, so the probability that in a crew with at least one of the 10 best number 1 is not there is
339,669/1,075,140 = 0.3159