Solve the system by using the inverse of the coefficient matrix.-2x + y + 3z - w = 14-x - 4y + z - 4w = 12-4x + 3y - 2z + w = 43x - y - z - 4w = 3
A. {(-2, -1, -2, 3)}
B. {(-4, 2, 3, -5)}
C. ?
D. {(-2, 1, 2, -3)}
Answer: D
Mathematics
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Find the derivative.s = t3 tan t - 
A. 
= t3 sec2 t + 3t2 tan t - 
B. 
= t3 sec t tan t + 3t2 tan t - 
C. 
= - t3 sec2 t + 3t2 tan t + 
D. 
= 3t2 sec2 t - 
Mathematics
Perform the desired operation. Write the answer in the form a + bi.(2 + 6i)(2 - 6i)
A. 4 - 36i B. -32 C. 4 - 36i2 D. 40
Mathematics
Solve the problem.The profit made when t units are sold, t > 0, is given by 
Determine the number of units to be sold in order for P < 0 (a loss is taken).
A. t = 14 or t = 18 B. t < 14 or t > 18 C. t > 0 D. 14 < t < 18
Mathematics
Give the coefficient and degree of the term.-6y15
A. 6, 15 B. -6, 15 C. 15, 6 D. 15, -6
Mathematics