Use Cramer's rule to solve the linear system. If D = 0, use another method to determine the solution set.7x + 8y = -565x + 2y = -14
A. {(0, -6)}
B. Cramer's rule does not apply since D = 0; ?
C. {(-1, -6)}
D. {(0, -7)}
Answer: D
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Identify the equation as representing either a circle, a parabola, an ellipse, or a hyperbola.5x(x + y) = y(10 - 3y + 5x)
A. Ellipse B. Hyperbola C. Circle D. Parabola
Evaluate.C7, 0
A. 6 B. 1 C. 7 D. 720
Solve the equation in the interval [0, 2?). Express solutions as approximations to the nearest hundredth.2 sin2x + sin x + 1 = 0
A. ? B. {4.71} C. {0.52, 2.62} D. {0.52, 2.62, 4.71}
Solve the problem.The altitude above sea level of an airplane just after taking off from an airport on a high plateau is given by the linear function y = 900x + 3257, where y is in feet and x is the time in minutes since take-off. Find and interpret the slope and y-intercept of the linear equation.
A. m = 900; The altitude of the airplane increases 900 feet every minute. y-intercept: 3257; The altitude of the airport where the airplane took-off is 3257 feet above sea level.
B. m = 3257; The altitude of the airplane increases 3257 feet every minute. y-intercept: 3257; The altitude of the airport where the airplane took-off is 900 feet above sea level.
C. m = 900; The minutes since take-off increases 900 for every foot of altitude. 
; The minutes that the plane takes to get to the altitude of the airport from sea level.
D. m = 3257; The minutes since take-off increases 3257 for every foot of altitude. 
The minutes that the plane takes to get to the altitude of the airport from sea level.