Use a graphing calculator to solve the system of equations. Round your solutions to one decimal place.1.9x + 15.8y + 4.5z = 4.94.6x - 7.0y + 0.9z = -3.13.6x + 15.5y + 4.3z = 8.0
A. (0.3, 0.2, -0.7)
B. (1.6, 1.1, -3.4)
C. (0.7, 0.5, -1.5)
D. (3.6, 2.4, -7.4)
Answer: B
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Find the magnitude and direction angle (to the nearest tenth) for each vector. Give the measure of the direction angle as an angle in [0,360°].
A. 13; 157.4° B. 15; 157.4° C. 13; 112.6° D. 13; 22.6°
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. The following regression equation is obtained: 
where x is number of hours studied and y is the test score. Predict the score on the test of a student who studies 12 hours. Round your answer to the nearest tenth.
A. 80.1 B. 85.3 C. 85.1 D. 75.1
Solve the equation.
= 
A. 
B. 
C. {4}
D. {16}
Solve. The polynomial 3x2 + 4x - 95 represents the area of a parallelogram. Factor the polynomial.
A. (3x + 19)(x + 5) B. (3x - 19)(x - 5) C. (3x + 19)(x - 5) D. (3x - 19)(x + 5)