Solve the system of equations using matrices. Use Gauss-Jordan elimination. x + y - z + w = -5 3x - y + 3z - 2w = 7-2x + 2y + z - w =16 -x - 2y - 3z + 3w = -22
A. {(-2, -3, 5, 
)}
B. {(-2, 3, 4, -2)}
C. {(2, -3, -4, -2)}
D. {(
, - 
, - 
, - 
)}
Answer: B
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Write the complex number in trigonometric form, using degree measure for the argument.4
A. 4(cos 90° + i sin 90°) B. 4(cos 270° + i sin 270°) C. 4(cos 180° + i sin 180°) D. 4(cos 0° + i sin 0°)
Solve the problem.The motion of a spring-mass system is described by the equation 
where y is the distance in feet from the equilibrium position and t is time in seconds. If the weight is 18 feet from the ceiling in a state of equilibrium, find the time at which the weight first passes the equilibrium position.
A. 
sec
B. 4 sec
C. 
sec
D. 1 sec
Divide, if possible. If a quotient is undefined, state so.
A. 6 B. -6 C. -45 D. 45
Solve the percent problem.On Monday, an investor bought 100 shares of stock. On Tuesday, the value of the shares went up 2%. How much did the investor pay for the 100 shares if he sold them Wednesday morning for $1377?
A. $1327 B. $1405 C. $1350 D. $1400