Solve the equation.- 
x + 3 = 1
A. x = -3
B. x = - 24
C. x = 24
D. x = 12
Answer: D
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Solve the given differential equation.y"' - 48y' - 128y = 0
A. y = C1e8x + (C2 + C3x)e-4x B. y = C1e-4x + (C2 cos 8x + C3 sin 8x) C. y = C1e8x + C2e-8x + C3e-4x D. y = C1e-4x + (C2 + C3x)e8x
Provide an appropriate response.Two perpendicular lines form __________ angles.
A. 90° B. 45° C. 135° D. 180°
Simplify.
A. 1
B. 3
C. 
D. - 1
Solve the problem.A plane takes off from an airport on the bearing S29°W. It continues for 20 minutes then changes to bearing 
and flies for 2 hours 20 minutes on this course then lands at a second airport. If the plane' s speed is 420 mph, how far from the first airport is the second airport? Round your answer correct to the nearest mile.
A. 1111 mi B. 1011 mi C. 1010 mi D. 1110 mi