Given matrix A, find the indicated minor or cofactor.Find the minor M12.A = 
A. -12
B. -11
C. 21
D. 11
Answer: D
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Solve.Two particles, m1 and m2, collide in a head-on, one-dimensional, elastic collision. If the first particle had an initial speed of 1 m/sec and the second particle was initially at rest, then the final speeds of the two particles, v1 and v2 (in m/sec), are as follows: v1 = 
v2 = 
Express the difference between the final speeds (v1 - v2) as a single rational expression.
A. 
m/sec
B. 1 m/sec
C. 
m/sec
D. -1 m/sec
Use the definition of equality of complex numbers to find the real numbers x and y such that the equation is true.x - 5i = 6 + yi
A. x = -6, y = 11 B. x = -6, y = -1 C. x = 6, y = -5 D. x = 6, y = 5
Solve by elimination and check. x - 7y = -563x - 7y = -42
A. (7, 9) B. (-9, 7) C. (8, 8) D. No solution
Simplify.(18 - 42) ÷ (-4)
A. 6 B. -6 C. 28.5 D. -24