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 13 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. 64.4
B. 60.4
C. 75.6
D. 67.0
Answer: A
Mathematics
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Answer the following statement true (T) or false (F)
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Use an identity to write the expression as a single trigonometric function or as a single number.2 cos24x - 1
A. cos 4x
B. 
sin 16x
C. 2 sin 4x
D. cos 8x
Mathematics
Add. Simplify, if possible.-2 + 9
A. 11 B. 7 C. -7 D. -11
Mathematics
Solve the problem.How long does it take $1125 to triple if it is invested at 7% interest, compounded quarterly? Round your answer to the nearest tenth.
A. 18.1 years B. 15.8 years C. 15.8 months D. 18.1 months
Mathematics