Use set-builder notation to describe all real numbers satisfying the given conditions.A number increased by 8 is no more than two times the number.

A. {x|x + 8 ? 2x} or 
B. {x|x + 8 ? 2x} or 
C. {x|x + 8 < 2x} or 
D. {x|x + 8 < 2x} or 


Answer: B

Mathematics

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Multiply.(8x - 11y)2

A. 8x2 - 176xy + 121y2 B. 8x2 + 121y2 C. 64x2 + 121y2 D. 64x2 - 176xy + 121y2

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Simplify. Assume that all variables represent positive real numbers.4 + 

A. 8
B. 5
C. 16
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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 function is obtained:  where x is the number of hours spent in the lab and y is grade on the test. Use this function to predict the grade of a student who spends 18 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. 58.7 B. 55.1 C. 70.6 D. 51.1

Mathematics