Find an exact value. Cos(-7pi/12)
A. Sqrt 6 + sqrt 2
B. Sqrt 6 - sqrt 2 / 4
C. Sqrt 2 - sqrt 6
Sqrt 2 - sqrt 6 / 4

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Step-by-step explanation:

Convert the angle to degrees:

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Note, that is the sum of two common angles: and .

By the sum-angle identity of cosine:

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Apply the sum formula for cosine to find the exact value of .

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. In other words, and correspond to the same angle. Therefore, the cosine of would be equal to the cosine of .

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amount of oatypop that contains the prize = 40%

amount   of oatypop which doesn't contain the prize = (100-40)=60%

probability that hannah will win a prize

    = s +f s +f f s+ff   f s+ff f f s+ infinity.where f= failure,s= success

=   or 60%

probability that hannah only has to buy 3 or less boxes before getting a prize= (s) and ( f s) and (ff s) and (f f f s)

        = = 87.04 %  

step-by-step explanation:

correct answer is c. just did it

step-by-step explanation: