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KengaRu [80]
3 years ago
15

Ariel collected information about mockingbirds for a science project.

Mathematics
1 answer:
ipn [44]3 years ago
8 0

Answer:

420/30=14 beats per second, meanin 1680 beats is your answer.

Step-by-step explanation:

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Show that cos2x=cosx
PSYCHO15rus [73]

cos (2x) = cos x

2 cos^2 x -1 = cos x   using the double angle formula

2 cos ^2 x -cos x -1 =0

factor

(2 cos x+1) ( cos x -1) = 0

using the zero product property

2 cos x+1 =0    cos x -1 =0

2 cos x = -1       cos x =1

cos x = -1/2       cos x=1

taking the arccos of each side

arccos cos x = arccos (-1/2)         arccos cos x = arccos 1

x = 120 degrees   x=-120   degrees           x=0

remember you get 2 values ( 2nd and 3rd quadrant)

these are the principal values

now we need to add 360

x = 120+ 360n      x=-120+ 360n      x = 0 + 360n  where n is an integer


3 0
3 years ago
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Answer:

c

Step-by-step explanation:

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you must add 24+56 to get total amount of employees.

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therefore, the answer is 24:80

3 0
3 years ago
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3 years ago
A function which is used to represent a problem, and which can be used to solve the problem, is called a ____.
algol [13]

Answer:

i think it would be a model.

Step-by-step explanation:

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