Use elimination to solve the system of equations.x - 4y = -44x - 3y = -16
A. (-3, -4)
B. Inconsistent; no solutions
C. (-4, 0)
D. (-3, -1)
Answer: C
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Write the mixed number as an improper fraction.7
A. 
B. 
C. 
D. 
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 the grade on the test. Use this function to predict the grade of a student who spends 16 hours in the lab. Round to the nearest tenth. 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. 58.8 B. 72.6 C. 62.0 D. 54.8
Solve the problem.From the top of a vertical tower, 355 feet above the the surface of the earth, the angle of depression to a doghouse is 
How far is it from the doghouse to the foot of the tower? Round your answer to the hundredths place when necessary.
A. 681.46 ft B. 784.06 ft C. 693.86 ft D. 665.87 ft
Represent the vector in the form v = ai + bj whose magnitude and direction angle are given.
= 8; ? = 30°
A. v = 4
i + 4
j
B. v = 4
i + 4j
C. v = -4
i + 4j
D. v = 4i + 4
j