note that 5π /4 is in the third quadrant where the cos is negative
the related acute angle to 5π /4 is π/4, thus
cos( 5π /4 ) = - cos (π/4 ) = - √2/2
We can also evaluate using the addition formula for cosine
• cos (x + y ) = cosxcosy - sinxsiny
note that 5π /4 = (π + π/4 )
cos(5π /4 ) = cos (π + π/4 )
= cos(π)cos(π/4) - sin(π)sin(π/4)
= - 1 √2/2 - 0 = - √2/2
Each year the residents of a country purchase 60 billion ice cream cones. If there are 252 million people in the country, how many ice cream cones are purchased per person in one year?
Answer: Number of ice cream cones purchased by the residents = 60 billion
60 billion = 60,000,000,000
Number of residents in the country = 252 Million
252 Million = 252,000,000
Therefore, the number of ice cream cones purchased per person in one year is:


ice cream cones
Answer:
9
Step-by-step explanation:
15-40%=9
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