Find a matrix A and a column matrix B that describe the following tables involving credits and tuition costs. Find the matrix product AB, and interpret the significance of the entries of this product.
?
A.
AB = 
The number of credits for Student 1 is 17, the number of credits for Student 2 is 15, and the number of credits for Student 3 is 12.
B.
AB = 
The number of credits for Student 1 is 12, the number of credits for Student 2 is 17, and the number of credits for Student 3 is 15.
C.
AB = 
Tuition for Student 1 is $890, tuition for Student 2 is $790, and tuition for Student 3 is $640.
D.
AB =
Tuition for Student 1 is $790, tuition for Student 2 is $640, and tuition for Student 3 is $890.
Answer: C
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A. 
= 
B. 
= 
+ 
C. 
= 
+ 
D. 
= 
+ 
Multiply. Simplify the answer completely.
? 
A. 
B. 
C. 
D. 
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A. ±2, ±2
B. 2, 
C. ±2, ±
D. ±2, ±5
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A. (-?, -2) or (-2, ?) B. (-?, -4) or (-4, ?) C. (-?, ?) D. (0, ?)