Solve the problem.A study was conducted to compare the average time spent in the lab each week versus course grade for computer students. The results are recorded in the table below. By using linear regression, the following equation is obtained: 
where x is the number of hours spent in the lab and y is grade on the test. Use this equation to predict the grade of a student who spends 8 hours in the lab. Number of hours spent in lab Grade (percent) 10 96 11 51 16 62 9 58 7 89 15 81 16 46 10 51
A. 80.6
B. 73.7
C. 69.7
D. 75.3
Answer: B
Mathematics
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A. 0.1258 B. 0.9002 C. 21.3627 D. 7.9473
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Graph the circle.x2 + y2 - 8x - 4y - 16 = 0
A. 
B. 
C. 
D. 
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Use the elimination method by addition to find the solution for the following system.
A. x = 2, y = 24, z = -25 B. x = -4, y = 5, z = 11 C. x = 4, y = 5, z = -5 D. The system is inconsistent.
Mathematics