Determine whether the matrix is invertible.
A. Yes
B. No
Answer: A
Mathematics
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Solve the equation. 
= 9
A. -9 B. 9 C. -9, 9 D. 81
Mathematics
Write the conjugate 
of the complex number z. Then find z
.z = 1 + 4i
A. 
= 1 - 4i, z
= 1 - 16i
B. 
= 1 - 4i, z
= 17
C. 
= 1 - 4i, z
= 1 - 16i2
D. 
= 1 - 4i, z
= -15
Mathematics
Graph the function.y = 2 cot
A. 
B. 
C. 
D. 
Mathematics
Solve the problem.A rocket is shot straight up in the air from the ground at a rate of 77 feet per second. The rocket is tracked by a range finder that is 487 feet from the launch pad. Let d represent the distance from the rocket to the range finder and t represent the time, in seconds, since "blastoff". Express d as a function of t.
A. d(t) = 487 + 77t2
B. d(t) = 4872 + (77t)2
C. d(t) = 
D. d(t) = 
Mathematics