?
Find the cofactor C12 of the matrix.
?
A. C12 = -3
B. C12 = 2
C. C12 = 3
D. C12 = -2
E. none of these
Answer: B
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Find the exact value of the expression.cos 
A. 
B. 
C. 
D. 
Solve the problem.The paired data below consist of the test scores of 6 randomly selected students and the number of hours they studied for the test. By using linear regression, the following function is obtained: 
where x is number of hours studied and y is score on the test. Use this function to predict the score on the test of a student who studies 5 hours. 
A. 77.7 B. 67.7 C. 72.7 D. 74.8
Find the standard form of the equation of the hyperbola.
A. 
- 
= 1
B. 
- 
= 1
C. 
- 
= 1
D. 
- 
= 1
Use the properties of limits to help decide whether the limit exists. If the limit exists, find its value.
A. Does not exist
B. -?
C. 
D. ?