Write the answer to the problem as an algebraic expression.Two numbers have a sum of 38. One of the numbers is t. Find the other number.
A. 38 - t
B. t - 38
C. 38 + t
D. t + 38
Answer: A
Mathematics
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Use the matrix capabilities of a graphing utility to find AB, if possible.
A. 
B. 
C. 
D. 
E. not possible
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y² = 12x
Find the directrix.
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