Use a calculator to find a value of ? between 0° and 90° that satisfies the statement below. Write your answer in degrees and minutes rounded to the nearest minute.
?
cos ?= 0.5673
?
A. ? = 55°026'
B. ? = 54°028'
C. ? = 54°026'
D. ? = 55°028'
E. ? = 53°026'
Answer: A
Mathematics
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Although one simplification step has been taken, identify why each of the following has not been reduced to simplest form:
= 
? 
= 
= 
= 3
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