Use the Gauss-Jordan method to find A-1, if it exists.A = 
A. 
B. 
C. 
D. Does not exist
Answer: C
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Perform the indicated operation.R(x) = 4x5 - 12x4 - 14, S(x) = 7x4 + 8x5 + 3, T(x) = x6 - 5; Find (R - S + T)(x).
A. x6 - 4x5 - 4x4 - 16 B. x6 - 4x5 - 19x4 - 22 C. x6 - 4x5 - 19x4 - 16 D. -45x9
Find the derivative.s = t7 tan t - 
A. 
= t7 sec t tan t + 7t6 tan t - 
B. 
= - t7 sec2 t + 7t6 tan t + 
C. 
= t7 sec2 t + 7t6 tan t - 
D. 
= 7t6 sec2 t - 
Find the measures of two angles, one positive and one negative, that are coterminal with the given angle.192°
A. 552°, -168° B. 462°, -78° C. 552°, -258° D. 372°, -168°
Solve.Two plumbers make house calls. One charges $90 for a visit plus $40 per hour of work. The other charges $70 per visit plus $50 per hour of work. For how many hours of work do the two plumbers charge the same?
A. 2 hr B. 2.5 hr C. 1.5 hr D. 1 hr