Calculate the net profit margin for a lamp sold for $80 that has a $50 cost
of goods sold and 20% operating
expenses.
A. 28%
B. 18%
C. 25%
D. $14

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Identify the type of observational study described. a statistical analyst obtains data about ankle injuries by examining a hospital's records from the past 3 years. cross-sectional retrospective prospective

Can someone me with #s 8, 9, and 11. with just one of the three also works. prove using only trig identities.