Find all degree solutions to the equation.
?
?
A. 20° + 90°k, 50° + 90°k
B. 50° + 90°k, 65° + 90°k
C. 20° + 90°k, 70° + 90°k
D. 40° + 90°k, 50° + 90°k
E. 40° + 90°k, 70° + 90°k
Answer: E
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A 
is a rate with a denominator of 1.
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Solve the problem by writing an appropriate system of equations and using the inverse of the coefficient matrix to solve the system.The sum of the ages of Art, Ben, and Cal is 59. Art is 1 year older than Cal and Cal is 1 year younger than Ben. Which of these people were teenagers 7 years ago?
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A. -4?
B. 4?
C. 
D. 